Why exactly would programs running in web browsers not want the ability to access the most powerful piece of hardware in a users machine? WGPU unlocks an enormous amount of space for userland programs to explore.
I agree there have been some questionable 'advancements' in the web spec recently (web workers as a solution to multithreading, for example, were hilariously inadequate for quite a while), but as far as I can tell WGPU is a solid effort to unlock browsers as an actually interactive platform, instead of the fairly static image/text display devices they are today.
Maybe our visions of what browsers could or 'should' be are different