So as somewhat of an outsider to the 'web game' as far as most people here (at HN) are concerned, but a relatively aware patron of web browsing software, I'll add my thoughts on the 'web browser' game...
I feel like most people's browser of choice is chosen for reasons specific to their needs. For example: I think that Firefox gives me a bit of additional privacy. I think that Safari gives me that additional privacy as well. Some people may feel like Chrome just works. Some people just use what came with their OS.
When I do front end work, I tend to always test it in Chrome first. Their devtools make that part of my job (quickly finding issues with the frontend) a lot easier. Once it works in Chrome, I'm sure that the code is working, and any problems I encounter will just require browser-specific tweaks.
Anyway, long story short...I think that Microsoft really needs to pick something that Edge is best at if they want people to have a reason to use it (PS loading a highly browser-optimized page some number of milliseconds faster than the competition just doesn't do it for me, personally). Their niche has always just kind of been "well it's what comes with the OS" - and that's a fine way to get a userbase for sure. I'm not faulting them - but if that's their intended userbase, then I feel like they're putting a lot of effort into this whole browser game.
I guess at the end of the day, I don't trust IE or Edge or Chrome for my every day use. Whether that's poorly placed mistrust or not, I'm uncertain. But in either event, that's how I feel.