Penholder's main problem is the topspin to topspin game which they just cant really compete with shakehand. I will admit that penhold is superior when the spin is complicated especially with underspin type balls. But now with chiquita, there is simply no stopping a shakehander from forcing the topspin rally from the get go. It is the no.1 problem for penholders which I also exploit all the time.
I mean they can compete with shakehand on the topspin-topspin game... on the forehand side. On the backhand side, I agree that Penhold falls a bit short (except Felix idk what that guy did but it worked). Some ways to combat this are to have amazing footwork (see RSM and XX), a funky backhand (see MLin), or overwork it to hell (see Felix).
All three have side effects (that leave the end result still weaker than SH backhand, though they do work to a point.
Only LP can consistently convert a spinny opening loop back into a short backspin ball to force a push which makes the game go back to backspin + hunting for FH 3rd ball loopkill mode where penhold is favoured. The other way is TPB inverted chopblocking a spinny opening loop which is damn hard and basically gambling imo. The other TPB shots are not hard to deal with by 2x inverted shakehanders (face it we are your main competition lol).
Yeah you guys are our main competitor in the current meta lol, I won't argue about that. But having LP isn't the only way to prevent the forced backhand-backhand rallies where SH is favored, Penholders can also force forehand-forehand rallies, where they are 100% tied (Penhold might actually have the advantage because of wrist control being higher, and therefore spin).
You don't need to chop block it, you can just punch it. TPB has a LOT of control with the position, so using that with the lack of spin these punches have make a terrifying shot.
LP is also easily abusable once you know how it works, and twiddling doesn't save it often enough (blocking a smash close to the table is quite hard).
Also LP/inverted penhold players will also rely a lot on TPB inverted and inverted FH so it's not like you slap a LP on the other side and you lose the inverted FH and inverted TPB. The LP is just really for disruption and complicating the game.
While in theory this would work, twiddling in and of itself is the big problem. It just takes too much time to think about when to execute the action and the time it takes to execute it.
But, I do have to agree that the purpose of the LP is right to all levels. If a player is good at placing the ball and fast at twiddling, LP is the way to go IMO. But for most other players, I'd recommend inverted much more. There's a reason why it's more common for 2xInverted penholders to pop up.
But actually I want to recommend this to my cousin for fun, especially seeing all the advantages you mentioned.
My practice partner is a high level LP/inverted penhold so I know the style quite a bit. I personally tried shakehand anti BH and FH inverted some time but imo that is still not as powerful as the penhold LP/inverted style. There are just too many possibilities with LP/inverted penhold and imo even at the pro scene we havent seen it be played to the full potential.
Wow, that's pretty cool. Makes sense why you know much about it then lol.
However I have to disagree with your statement of LP/inverted having too many possibilities. 2xInverted has more possibilities with spin, speed, and control than LP/inverted. LP/I focuses too much on the opponent's attack to return a high quality ball, or it takes too much time to twiddle. 2xI on the other hand has more spin, more top end speed, more control, and more overall possibilities that you can control.