"IE standards" makes no sense. Yes the big companies dominate web standards, but there are still multiple viable niche browsers that work by conforming to that spec, and an extensive spec validation framework anyone can use (web-platform-tests). It's unreasonable to say someone could come up with an IE compatible browser since there's no promise or reality of a stable design.

But you're just putting yourself out on an increasingly brittle limb to defend native apps, which imo work against user interests.