I'll start in reverse. I can't say much about the last part. I mean, a lot of updates nowadays come with some form of outrage and threats of quitting. Some of them justified, others not so much.
As for the second part, about the pay walls, I agree. Having additional rewards for buying a pass is fine, but right now, for example, with GCs: we used to be able to get 4 feats most of the time, now 2 of them are locked behind an actual paywall and having the latest marquee at a certain star level, which can only be achieved if you spend tens of thousands of crystals or several hundreds of dollars (or whatever your currency unit is).
As for the first part, about Conquest, again, I agree. Conquest as a whole is not bad, I don't even mind how strong some of the enemies are - there are ways of dealing with the infinite TM ITs, or infinite TM Canderous, or Padme and her damage reflect, or Pao or Sabine attacking 14+ times in one turn. It's the feats requiring the newest characters or gaining buffs that only 1-2 characters can give that are frustrating. Yes, they are manageable for the most part, but a lot of them require very specific team comps and/or data disks, otherwise you have no chance, and leave you with little wiggle room to use other teams to progress without having to do a major grind later on. To say nothing about feats that require them to survive. Example, Win 10 battles with Morgan surviving; unless you have the right disks or a comp that can quickly and safely destroy the enemy team, there is no way you can use a low-gear Morgan with NS, they rely on revives and Morgan prevents them, so the moment she dies there's no use trying.