Yea, Flutter Web isn’t viable and likely never will be. The approach will require re-implementing browser primitives (like copy paste) which means you’re always going to need to ship a ton of JS to clients which makes it antithetical to the PWA approach.

EDIT: thanks for the downvote. But you don’t have to take my word for it, this sentiment is (privately) shared by Googlers themselves working on Chrome and PWAs.