I think its because we might be seeing it from two different points: i.e. you see Flutter Web using Skia is not consistent with _other websites and thus traditional webapps_, I see that Flutter Web using JS/HTML made it _not consistent with deployments of the same Flutter code to Android/iOS/Mac_
Definitely see that viewpoint and why it's problematic, would argue as an independent dev, would care much more about 100% self-consistency across my product line up for ease of support than whether people open the app in a web browser, you can right click on anything that looks like an image and download it.
Understand that viewpoint _also_ sounds like sacrilege, but as someone raised on iOS dev, reminds me of when Mac devs being upset over years as "iOS-isms" made their way to the desktop. I love that this approach is an example of solving hard problems over years, fixing a industry-wide yak shave that ended with you having 50 copies of chromium. solves the same problem Electron is solving with none of the downsides
This is the issue. Instead of having one codebase that works the same on all platforms (ios, android and web), you get (as a developer) the blame for not implementing things correctly across the different platforms.
Instead of a cross-platform development environment doing that for you.