This isn't an agree to disagree thing. It's not a matter of opinion. It's objective, and measurable.
Firstly, we have lots of examples (literally every issue brought up) and can tell by this large sample size that what someone might consider an issue turns out not to actually be one. What is pure speculation and opinion is your claim that we'll never know because people who don't like it wont' use it.
Secondly, that's not what AL is. AL is actually mostly playing all of the long campaigns that have been out (ToD/RoT, SKT, ToA, PoA, Ravenloft, etc, etc). There are many other smaller one session modules that are played in the AL, but the majority are the actual campaigns. Your assumption here too is incorrect. And since an AL DM can't just ignore the spells/abilities/combos they don't like like you are arguing, then if in fact this is a problem, we'd definitely see it in AL play.