I think it depends on how many bugs you can tolerate also.
There are many bugs I tolerate and accept as a gameplay feature - mainly the reputation issue where you get penalized for ending deals that is not your fault (trade route cut, civ gets eliminated). That is some deeply rooted AI issue that was made clear long ago can't be fixed with a patch, or would require so much resources, all other bugs won't get fixed.
I also use submarines extensively and I do play my game (intentionally or not) into the modern age so these units come into play. These subs being broken hit me more than others I suppose. But its also an issue with modders and scenario players as all invis units will trigger a war with a country when their unit walks into yours, inadvertently. What's really annoying though is this was fixed in PTW. So we know its fixable.
Can you play 1.22 and fully enjoy it with these bugs. of course. But its impact varies. That said, the barbarians and sub weren't broken before, and all we're asking is for them to be fixed back to where they were.
AI use of armies have always been spotty at best, but now they use them even less. If the don't fix it, I can live it with, but I'd them to do something about this to make the AI a bit more competitive expecially since armies got more powerful with C3C.