And many infotainment and desktop frontends are just web UIs...

It is surely not the default frontend on many business that still rely on native apps, on mobile devices, device displays, air gaped networks, factory automation and robot control systems, ....

Yes, but the web browser is ubiquitous so it's naturally going to sponge up defaults.

If someone's mad that people don't auto-assume they design robot neural interfaces when they call their self a front-end designer, then they're just fighting their own ego.

That is just like saying that we should all start calling our compilers transpilers, given that the word misuse is so ubiquitous among JS devs.