I personally think we should get more mid game bosses the gap between next boss you can take in insane at times IM LOOKING AT YOU HARD LOTUS.
EXAMPLE: Lotus 2 trillion HP is possible for a party capers to kill, Hard Lotus though has been unkilled in gms for a year due to it's first form taking so long to kill(lazers instantly kill you if they hit you and are insanely fast) and Hard Lotus has 8.2 trillion HP and has absurd defense.