My guess is marketshare. Kind of like what Brave is doing, Brave Unveils Development Plans for Upcoming 1.0 Browser Release, Including Transition to Chromium Front-End.
That's a reason to go against the current! Otherwise all browsers will be the same browser in the end.
There's value into building platforms on top of the same rendering engine but there's also value into not having one single rendering engine :D
I understand the choice Brave made because they have few resources, but Microsoft is huge :D I just hope someone will write an article about the choice so I can better understand it. I'm not saying it's wrong, just that I don't have a fully formed opinion.
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