It's the typical finger pointing at others.

Using a Bitcoin private key to login only makes it more secure if you sign offline, but nobody is going to do that all the time. Adding browser addons increases security risks.
Signing in to websites through the browser has worked fine for decades, just because something is new, doesn't mean it's better to use it. How many of the "blockchain is going to disrupt whatever industry" BS still exists after a few years? There's no point in complicating things just for the sake of claiming "we're using Bitcoin" while it has nothing to do with Bitcoin.