No they did not go to what they used before, usually if I give such an advice it's because it is clear the equipment is really a bad choice for them, otherwise I think equipment is anyway a very minor aspect to focus on.
Same in my case, most of the times people had a wrong setup before and then a wrong setup now too as they changed without really understanding where they came from or went to. Otherwise, like
@Matteones mentions, if I see equipment is fine-ish, I would not say anything and just let them focus on technique and getting better in peace.
Playing better is measured by their results, yes we have a ranking system and a league system, very structured: local --> regional --> national, played pretty much every weekend for the federated players (who are 60 - 70% of the club members, with the rest being true amateurs of a very low level, tipically 1 year of play, or very old, or very young) from September to June.
Yep same, plus for people who don't play in competitions, tecnique, footwork, tacticts is what determines better. Plus own happiness ofc.
Only the top 2-3 players of our club use D09C or some similar hybrid (both "low level" professionals, playing in various leagues in Europe). We then have 10 professionals and mostly semi-professionals ranked under them, none of whom uses hybrid (with me being at the very bottom of these 10 being the only one who was using hybrids, now I have put a H3). I can tell you exactly which rubbers they are using if you want, it's tenergy05, nittaku genextion, joola dynaryz AGR, ACC, Tenergy 80, one tried zyre and is going back to tenergy 05, dignics 05, Hexer don't remember which one, Tenergy 19, I may forget some more. Most used blade is for sure Viscaria).
Of the following players, let's say the next 20-30 players are high level amateurs (1900 - 2200 USATT more or less I imagine), most of them young (under 25 - with some exception of good players with a lot of experience) who play in lower national league and higher regional leagues, of which one already has a hybrid because we saw it fitting for his game.
Another young player (16-17) who is quite lower level (maybe 1500?) in comparison to the other similar age kids of the same group is using the D09C that one of the top players has gifted him, and he really shouldn't as they are way too hard for him and whilst he sometimes looks good in open rally training exercises, he has very little control in real matches situation.
Let me explain our club structure here too, maybe that helps the discussion.
We have about 130 members and abour 20 teams scattered across regional and national level. The netherland is smaller than Italy so just region and national leagues. A total of 8 divisions regionally and 4 divisions nationally, the division of honor being the highest of all. We're for sure smaller and less pro than Matteo's club.
From our members, the highest play either under the division of honor, or one below, they alternate depending on team composition. In the long past a few played division of honor. From these, the older players have played for a long time with the same equipment and don't have really fast and stiff outer blades with dignics/tenergy/zyre. The younger ones have faster blades and for sure dignics/tenergy. Often dignics 05 or T05 (hard and sfot). None play 09c, hybrids or chinese rubbers on FH, mostly we are a 'tensor' club, me being the only weirdo

From the lowest national levels the same pattern applies, the older generation uses normal tensor rubbers, nothing fancy, the young ones come with the heavy stuff

In total we have about 10 national men and 6 national women. Women's game is lower in level, and rubbers/blades there are normally intermediate things. Some rubbers I see (and have pasted) often from all these players that are not young ones: Fastarc G-1, Gewo El Pro 48, Razka 7, Stiga Platinum, Stiga Mantra, Tibhar Nimbus, Xiom Vega X/Pro. For blades, a mix of all things, outer, inner, all wood. For sure Viscaria is not the most used blade, in fact, almost nobody uses it or has used it. Blades that are common: Timo Boll ALC (yes outer but more controlled than other outers), Innerforce ALC for example. Funny how people do TB ALC which is the same as viscaria (wood wise), but no viscaria, I wonder why.
Then the regional level, usually I see the same mixed pattern but with more 'elite' rubbers here as people try to change more often to 'boost' their performance. Most people train twice a week for about 2-3 hours so it's not super intensive. I see here more tenergies in comparison to the above group, often 05, sometimes 80 or 64. Also dignics 05 is not uncommon for people to try, one player tried 09c and hated it and threw it away in 1 week (pity he didn't give it to me xD). The rest a mix of tensor rubbers again. Mostly I see yasaka, gewo, xiom, tibhar, stiga and donic dominating, things like the above mentioned but also bluefire for example or dragongrip. Blades a mix of things too, outerforce ALC, Xiom Stradivarius, Joola Tezzo warrior, hurricane long 3, violoncello, acoustic, korbel, skc7, true carbon, innerforce ZLF from top of my mind now.
We are bigger on adults than kids but it's growing now, kids use usually all wood, some inner but most all wood 5 or 7 plies, and the majority does normal tensors, only a few play with hurricanes like me.
Hopefully that helps a bit understanding our european club!
Would be nice if others explain their club structure and most common equipment too!