It's kind of funny.
Mono Hard: I can kill the left boss before he heals for the first time. The right is also dead after two 9+2.
Top Right: I did not even realize that the bosses (Hard) have special abilities because I killed them so quickly.
Top Left: Is so incredibly easy with MGX, 9+2 and 2 LR (VS).
For the players who have been around for a long time, the events are not a challenge.
For the others it is (especially Mono Hard, because of the DOT and the Heal) only more time-consuming.