I don’t mind the white. Apple is very much doing a modern version of older design styles with everything, and the white with colors is the same as the old school colored iMacs.
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That being said I think higher-spec iMacs like the 27” (or whatever size it is) will get more traditional darker colors and black bezels.
The fun colors and white bezels will also help differentiate the power user macs from the consumer macs. It’ll be more clear once the full lineup is released but right now it’s understandably confusing because even apples lowest level tier of macs (M1) can outperform some higher spec Intel macs. So I get why some power users think these machines are for them, but really these are baseline consumer macs meant for the general mass market.