This is trying to sell the concept of a chrome-less browser-window ("install as app"), a feature your browser already has.
Do we need to link to that famous Dropbox comment again? Sometimes convenience can be enough.
Dropbox offered far more than just convenience. And at least it was something new.
This on the other side has very very slim novelity and convenience. And tools like this exists since at least a decade and never really took off. Maybe for a reason?