I dunno how people would nitpick floating platforms when Castlevania wasn't about realistic "logical" platforms in enviornments. the IGAvania floating platforms whenever they are there, still make sense for the style of that type of game design/world. It's still immersive. it's not like they just place floating platforms anywhere.
IGAvania/Bloodstained worlds are different worlds, and it is possible for floating platforms to exist, even if they are not connected to the background or foreground structures. magic is a big part of these games and its possible for castles to have floating platforms here and there.
if people are going to nitpick floating platforms, then I guess they will start demanding fall damage as well for the sake of atmosphere.