I'd argue we still want to change the default colors to be more distinguishable as imo it'd just generally improve the default experience.
Changing player colors only on your end also has the downside of making communication slightly harder as e.g. "lets attack red together" doesn't make much sense anymore if everyone sees "red" as a different player.
This was discussed and also my reason to reject it. But the entire idea of the change in question was to add support for color blindness. And once you do that the colors change regardless. So here we are
I also disagree with changing the TMM colors by default - as it is a never-ending slippery slope: the next color set may work for you, but not for someone else. And then the cycle repeats.