Yeah it definitely feels that way. I reckon it has a lot to do with the servers too though. Even netflix.com is far superior to prime video / apple tv+ browser versions. In fact it feels virtually identical to the app version.
For Netflix it has a lot to do with how they integrate with the TV's. They tend to integrate directly with the chipset vendor, and then ship their own SDK that the TV vendors integrate. Everyone else is relegated to use the terrible shitty webapps like development with no debugging capability. So for Smart TV's at least, Netflix is on a whole different level than everyone else.