I kinda of feel the same as you, but I have the theory that maybe Biomon, Fakemon and Beautymon were being mind-controlled by Charismon at some extent, in the sense that they agree with the task of eradicating the Appli Drivers, but they are not entirely "evil" per se, so their appli motif is stronger when Charismon is not around (compare their ruthlessness with the one showed in the ep. 37).
After watching the sub, I have to admit I felt kind of sick while watching the scenes of Biomon & Rei and Hackmon...dude, this scenes are so intense and disturbing, but I really enjoyed them for some reason. I would have never imagined Rei being that sadistic.
Apart from that, I would have never thought that we could see a villain more obssesed with beauty than the
Lord Knightmon of Digimon Frontier...and then we get to see Beautymon lol Either way, that was a nice reference!!
Ps: Please resist a little bit more Yujin & Offmon!