Pink Brains with feet? You mean Intellect Devourers? The Mind Flayer pets that are a staple of D&D? I don't know any campaigns that feature Mind Flayers without Intellect Devourers at their sides. And yes, their design in BG3 is accurate.

[img]https://media.wizards.com/2014/downloads/dnd/MM_IntellectDevourer.pdf[/img]

The original games had plenty of sunny areas and weren't doom and gloom environments all the time. All I'm saying is, the demo for BG3 showed variety (sunny beach, dark dungeon, scary crypt). If that's not enough for you, I don't know what to say.