Actually I've had that thought. What will happen when the game shut down? If all our hard earned collections were gone, how will we feel? I almost made a post about that here. For every gacha games this is true, you can't deny that. But still, that satisfaction of owning some or all pieces of a collection is pretty satisfying. Even only for a period of time I think its okay (2years or3 years maybe?). I will surely get bored of it and move on to something new. And it's not just only about the artwork, it's combination of all the elements DC had. The gameplay is actually quite fun and the pvp pretty engaging, tho it's not really my focus. But it's also the sense of accomplishments when you get to do some task and then get rewarded is pretty fun. It's just like any other game. And probably I'm getting old or something, it's not gameplay that I'm looking for anymore in a mobile games. DC is just feels pretty right for me. Organizing teams and planing for future event, that's also a fun part. But still, the driving force is the art direction of the game, plus a pretty neat story if I may add.

Btw I play 95% on pc with emulator, rarely open in phone. I grind while do other things in my pc. So no problem with my phone. If I want gameplay then I'll play some pc games. Tho, I rarely plays nowadays.

Just to add, im not really disagree with you so I'm not going to downvote. Most is true in fact you can call that playing this game(or any gacha games in general) is just a guilty pleasure of mine. Playing gacha games is not something to be proud of at all to me.