The biggest feature I miss is being able to download shows locally. It's not hugely hypothetical either - just putting the ipad app on the mac isn't a huge leap anymore, and would solve most of what I'd want.

It's a bit nitpicky but one of my gripes with PWA is that no implementation I've seen thus far gets titlebars right under macOS, which is a bit distracting.

Additionally, there doesn't seem to be an API for PWAs to surface menus to the system, which means productivity stuff like Google Docs is stuck with redundant in-browser menus.

some of us just prefer native apps. you never get as much functionality out of a browser tab as you do from a full app

But you can extend things so much easier inside of a browser tab (Greasemonkey, etc) than you can with a native app.

I know this is a thing, but really…who does this? The last thing I want to do is spend time tweaking someone else’s web site (unless I am getting paid to do it).

Wanikani users apparently.

This is actually a solid counter-point. My concerns with browser extensions is that you can't necessarily trust them or find something you want done, but I concede that having the option doesn't require you to do anything, whereas a native app doesn't necessarily give you the option.