Well...film history disagrees with you.
Cartoon color palettes were more muted in the 30s and 40s because Technicolor itself advised studios to make them that way. Technicolor famously (sometimes
infamously) tried to control palettes in live-action and animated films to give a painterly look and avoid glaring, gaudy color combos. By the 50s and 60s, cartoons in general had become more vibrant and experimental. Nobody was letting Technicolor call the shots. There are plenty of stylized Disney shorts, not to mention the output of Chuck Jones’ era at Warner Bros.
For the year 2020, Disney could’ve combined a vibrant, stylized color scheme with classic Mickey models that are better animated, more fun to watch in motion, and truer to “Mickey” rather than Cartoon Network or Nickelodeon.
But Walt’s Mickey doesn’t strengthen Bob Iger’s ego for content from his tenure as CEO. As WDI has mentioned in presentations, Iger made the call to use this Mickey.
Funny thing is, if this would’ve been a one-off series of merch like Electric Mouse or Hipster Mickey, I would’ve liked it better than an outright attempt to replace Walt’s Mickey Mouse. This was an attempt to compete with the cheapo style at Nick and Cartoon Network, and the company had already retired it before Iger “earmarked” it for this attraction.