[Hixie]

I mean, I try to use Devtools on other sites, but I haven't really had any real success with that for years. I don't know how many of the rest of the web's ~4 billion users try to use DevTools but I can't imagine it's anything close to a majority. Or even a large minority.

FWIW Flutter isn't trying to replace the web. We're trying to offer a way of writing web apps that aren't really possible today. For example, something like the Flutter Folio demo, which works on multiple platforms including web, was written in a few weeks. I cannot fathom how I would do that without Flutter.