Samsung should not change anything in the Google Android Accessibility. It should keep this API as it is and on the another side Samsung Accessibility API should also be exist. Now Samsung is changing Google Android Accessibility API that's why compability issues are appearing.
I am using Samsung Galaxy A33 with Samsung Talkback and the TTS, Voice Assistant, Browser and many other apps of Google but due to Samsung Talkback and Samsung Bixby i can not give command to Google Assistant for On and Off the Talkback.
I can not use Google Accessibility sweet and Google Talkback because Samsung does nod allow us to download these apps that's why Samsung Accessibility and Google Accessibility both should exist in the Samsung mobiles at the same time like now we have botb Google and Samsung messages apps. It is totally upto the users that which app users want to use.
