I agree. There's absolutely no reason to have photoshop in the browser. If you want to sync your files with 'the cloud' you don't need a browser for that.
Its not a big pain but it would make my life easier!
Photoshop on a Chrome Pixel, for instance, makes a lot of sense.
The only thing I'm locked into is Chromium, and even that I can replace.
I'd like to add Chromium to your list.
And your answer is... that... "vendor lock-in"?
I'm sorry, but you're making zero sense.