One thing I like is that I can use them in my browser with tracking protection. Also nice to know it only has access to browser API's I give it access to - I'm always somewhat weary of what native apps do in the background.

And of course, there's the first-use hurdle. I probably wouldn't even have tried Pinafore if it hadn't been a PWA (in fact, I haven't tried any Mastodon apps). I could just go to the website, sign in, and I'm off.