But this isn’t necessarily true. The change in default targetingAI can very easily eliminate any benefit to garrisoning because it fundamentally creates an “overkill” issue with all garrisoned units aiming at one unit. That might make garrisoning only “useful” where a defender is vastly outnumbered, which isn’t particularly desirable in late game and creates balance issues in early game. And, that isn’t something that can just be fixed with balance because early game and late game concerns demand opposite balancing changes (early game would need CCs/towers to be nerfed while late game would need CCs/towers/forts to be buffed). Thus the default targetingAI change could have very large meta change impacts, which may or may not be desirable.
Even if you don’t buy any of the above, the change is fundamentally a preference issue, which may or may not be inline with the player base general preferences. It’s not like there is a chorus of people demanding this type of change. So it is far from clear that this undoubtedly an improvement like you suggest.
Honestly, I’m happy with the way towers/forts/CCs are balanced now (and it seems like most others are too) so the change is entirely a change of behavior instead of a balance issue. The problem is it isn’t even clear that change of behavior is actually desired.
I'm not entirely opposed to it. But I do have some big concerns. This is the type of thing that could entirely change the game meta, so I think it’s important we get it right. Testing in RCs has obviously missed some very big meta changing balance issues in the past.