Been doing some gen 8 random battles on showdown and I honestly don't find dynamax an enjoyable experience. Maybe they're still trying to work out all the kinks when it comes to simulating the new generation, but megas and z-moves were much more fun to use. Being obliterated by a dynamax pokemon in a single hit with them either getting a stat boost or you getting stat debuffs is honestly not fun to play with. Yeah, it lasts three turns, but by the end of it you've probably lost a chunk of your team and have to fight against a pokemon with several boosts.