So has the app been put back since the issue was fixed?

So you can have a portable device with a larger screen than your phone? For general media consumption?

No it doesn’t. Also you can just relock the bootloader. Google doesn’t care.

I think that’s Samsung. The Pixels don’t have a fuse AFAIK.

Well depends on why you’re unlocking the bootloader. Some people just want root but not necessarily a custom ROM. Though for some phones a custom ROM may be more appealing than others.