I wish people would stop calling it millennial grey. It's Gen-X grey. Kim K and Kanye were the ones who built the logical conclusion in their contrast-less white casa; millennials are born maximalists who pair tech accoutrements with actual wood grain because their fondest memory is of being sat in front of a PS1 and a CRT housed in a stained oak cabinet in their childhood den, wires, manuals, remotes, and jewel cases hither and thither.
Yeah I've noticed that millennials are often maximalists, years and years of ghastly 'landlord white' paint jobs contributed to that as well I think.
I'm currently renting but looking to buy in my area, I'm sure I'll find the chemical stripping of horrible white gloss paint and the painting over of 'minimal' white walls with a riot of colour outright cathartic. The house I'm renting would look so good if someone took the time to undo all the bodge jobs and cheap decoration choices I think. The lovely hardwood doors have proper brass hinges for example but it's all covered up with decades' worth of horrid white paint. Half the houses round here probably have gorgeous hardwood floors under crappy laminate or lino, and almost all have nice fireplaces I'd love to reinstate and use with a wood burner.