It's the universal runtime environment, so it stands the chance of commoditizing their platforms. There's no reason that you can't access the next killer web-app on a smart-fridge running HarmonyOS.

But they do recognize that they have to supply a servicable browser, because if they don't, people will pick up one from somewhere else.

So look where Edge (and Safari) focus their efforts-- begrudgingly matching the things they HAVE to match on Chrome, and adding on stuff like search and shopping tools or privacy gimmicks-- nothing that would make the web environment as a more free-standing platform that could displace native software.