content volume's fine — big unit roster, evolutions, the extermination event gave me stuff to chase. problem is the core loop is just roll the banner and pray. as a collector i want the full unit index but half of it is locked behind luck and limited banners that rotate out, so a true 100% isn't even possible if you missed a wave. meta also swings every patch so your maxed units get benched. it's a 3. functional gacha TD, not built for completionists.