>>45621672Dynamax is a mess because it completely disrupts the concept of counters and checks.
You can quite literally safely send in anything with enough bulk against something that would otherwise one-shot it, have it survive the impact, and then one-shot THEM with something that otherwise take two hits to KO unless they ALSO Dynamaxed.
Even worse is that unlike something like Megas or Z-Moves, which are generally reserved for heavy hitters or those that can utilize the usage best, virtually any Pokemon can pull this off with no indication, because it only makes sense to build an entire team of Dynamax Eligible Pokemon for mindgames' sake. Every single turn you make becomes more of a coinflip than ever before, because if you fail to read your opponent correctly regarding the Biggie Big Button, you might as well forfeit right away while they're making their Maxed Pokemon even more of an unstoppable prick even after they've went back to normal thanks to moves that not only deal damage to your side of the field, but apply Weather/Terrain Setup and Stat Boosts to benefit their side.