I think it's just that the end game right now kinda sucks. It's just sitting around waiting for 2 specific urgent quests, and then basically pulling a lever on a slot machine. There's nothing else to do that will result in better gear. So naturally I feel kinda bummed when it FINALLY comes up and I pop every booster I have, only to again get nothing. Then it's back to idling in the lobby until the next UQ because I don't want to waste my 700% drop rate on a useless expedition or whatever. And hopefully the next UQ is one of those 2 and not blackened kingdom or something!
EP4 is just really lacklustre so far. I like the new UQs and crafted techs, but the upgrade path is really quite awful and it's actually kind of amazing how little new gear it offers for an RPG expansion. There are 3 new units you can reasonably kinda get after some waiting and grinding (circunion), and then a handful of others that you probably won't get because instead of having over a year for EP4 (JP), we now just have a few weeks and apparently the drop rates weren't adjusted accordingly. All the new weapons are trash and the 14* unicorn drops are essentially unobtainable.
So that's all we can reasonably expect to get without crazy luck: 3 slightly better units.
That's amazingly bad! If people just had other worthwhile stuff to do outside of UQs, I don't think it would be so bad though. Throw some of those unicorn drops into the ridriod quest drop pool or something, I dunno. So much of the content goes unplayed because there's no point and it feels like a waste of time. Or make the new units tradeable so people who get duplicates can spread the luck around!
Honestly if they hadn't given us slave/nemesis so early it probably wouldn't be so bad either.