If you are going to create simple static homepage or interactive website, I don’t think Flutter is the right tool. Full fledged cross-platform applications is what Flutter is meant for.
Websites should still support accessability, I would even go as far to say it's a must. I just don't want people to mix up web-applications with websites. I've seen some people create a simple "websites" with Flutter which is totally pointless because it could just been created with html + css.
There is also a section in the Flutter docs that talks about accessability and how you can create accessable apps but I don't know how well it translates to Flutter web.
https://docs.flutter.dev/ui/accessibility-and-internationali...