My thoughts on this topic are this:
If it wasn't for having something to talk about with you guys, and to a lesser extent my IRL friends who play, I probably would have more or less quit playing after I reached roughly endgame. I feel like I've mostly done stuff, and all that's left is whale dungeons that don't seem fun to me. That doesn't mean I won't give them a try eventually, but I'm not feeling very motivated. Honestly what's got me most excited right now is actually multiplayer. I enjoyed that last multiplayer challenge a ton and I'm looking forward to doing it again some time, so as a result I'm branching out and leveling as many viable cards as possible to give me the best chance of having a good match with somebody else. I may also try to get really into the next ranking dungeon, although it will have to have non-bullshit design for me to want to do that. I have to find my own fun to a bit of a degree at this point (Project Shinji is still on), and I'm playing less than I did at my peak, but I'm still having fun.
As for game balance, I think I'm severely warped in my perception of it by other games I play. I've alluded to this before and may have even mentioned it, but I'm a longtime player of the tabletop game Heroclix. It's a superhero miniatures game that I've been playing since I was eleven years old, and not to brag but I'm really, really good at it. And it sucks, and that makes me sad in a way that it's hard to articulate. This game is honestly probably the thing I'm best at, and I've logged thousands upon thousands of hours playing it. I've met a ton of good friends playing it, I met everyone I've ever lived with through it including my current roommate, I've made a decent amount of prize money playing it (not talking Magic levels, but enough that I've probably just about broken even on Heroclix expenses overall). If it wasn't for all of the good friends I have at my weekly Heroclix games I would have quit long ago, but I love having an excuse to hang out with them.
So I have all this invested in the game, and it fucking sucks. It's a bad game made by incompetent, greedy designers. Things are looking up a tiny bit in the sense that they've resolved to overhaul design in a big way, but their track record is abysmal. So anyway, I say all of this because it's made me blind to bad design to some degree. No choice Gungho has ever made has even come close to equaling the pay to win bullshit Heroclix spews out in a PVP game on a regular basis, and that's without even getting into the way their game encourages players to use strategies that aren't fun, teaching them to hate the game and that trying to have fun is for suckers. PAD could be fucking up left and right and I would barely notice because I'm used to much, much worse. I've just become a bad judge of this kind of thing through such constant and personal exposure to abysmal decision making.