That's why people are resistant. You're basically saying "Screw Tolkien, it's only Game of Thrones for me!", whether you're thinking that way or not, that's what you're de facto advocating.
It's even worse than this. Many of the "keep it grounded" folks want only martial stuff to be grounded Game of Thrones but seem fine with tons of Dr. Strange wizards running around.
To me this is the real disconnect. It's very genre mixing that doesn't happen often in fiction because it's not enjoyable.
If you are going to have comic book/superhero magic then you should put in comic book/super hero martials in a team based game (or need meta bennies).
If you want more grounded martials than look to much more limited magic users and you have something that also works.