The problem with the news that IE is going to a Chromium browser is that the things that Google is doing, or trying to do (require SSL on all sites, favor AMP) gets worse. When they own market share, or even worse almost total dominance, nothing stops them from attempting even more of these types of things.
This is the main reason why choice is a good thing. I like Firefox and I think I’m going back to that to help support a more balanced internet.