The unspoken assumption behind this comment seems to be that rubber asymmetry should be the default configuration....
Nah, Baal, that was someone else. You have me wrong. You must have been reading what someone else wrote.
If you missed what I said it was that for some people, the same rubber on both sides is better. For others, that is not the case. The reasons why one person may be better off with the same on both sides and another person may be better off with different rubbers for FH and BH are many and varied.
Trying to think that there should be a rule for either both the same, or two different misses the point that people are people and we are all different and sort of unique.
Trying to figure out ideas, conceptions, reasons and theories for thinking people should use different rubbers on FH and BH is overthinking the EJ issue. But so is trying to figure out ideas, conceptions, reasons and theories for why people should use the same rubber on FH and BH.
We are adaptable and many people can do either. Some people should have the same on both sides. Some people shouldn't.
I've had the same on both sides, different on each side and neither was bad, both were good, both worked fine. I adjusted to whichever setup was in my hand without too much of a fuss. But I know some guys who are very fussy about equipment.
Personally, I think that sometimes that fussiness is psychological. And I don't think we need to over think the issue of whether you should use the same rubbers on both sides or whether you shouldn't.
Timo Boll is pretty great--despite his getting older--with T05 on both sides. I'm not going to argue that that works. It definitely works for him. But FZD is pretty good with two completely different kinds of rubbers on FH and BH. There are plenty examples of both. I think it is because either is possible and either could be fine depending on the person. For some people one will work better than the other.
So let's not overthink either. We don't need to insist people need different rubbers on each side because not everyone does. And we don't need to insist people need the same rubbers on each side because that won't work for everyone either.
Humans are way to complicated to come up with overly simplified rules about stuff like this.