Android on TV vs Chromecast built-in (official Android TV)

Recently, I have seen TVs announced as official Android TV (Android 11) with Chromecast built-in. But these TVs are hardly usable without setting up a Google account. However, I am aware of TVs with Android 9 completely usable by adding a Google account, that includes a media player/web browser, access to external storage, and even a specific store for apps. I can't find a comparative but at least I found some differences and big limitations: - The lack of a preinstalled web browser - A limited and restricted Play, no Chrome or Firefox - Not possible to install APKs from external storage - Some apps installed from APKs are not recognized by the default launcher (requires a sideload launcher) Is there information about all the limitations introduced by Google? Is it possible to move to standard Android/Play? Would future updates of Android TV remove potential installed APKs?