Beta refers to the editor, not the framework or the app.
Some features available on the classic are (were?) not available on the beta. For example it was impossible to add linked tables (it is now).
The beta editor provides a better interface for the same old features. For example you can look at the git history on both, but on the beta it looks much better.
But the beta also gives access to features that were not available on the classic. For example you can see the git history, but you can also manage multiple branches merge conflicts and much more.
Other features only available on the beta include management of multiple environments, multiple databases and much more.
When you read “it will only work from BETA editor”, it means you will be able to edit the app only on the beta, but the app will just work.
I don’t know what happens if you try to edit an app with multiple environments or databases with the classic. Maybe you will only see the default environment and the default database and the default branches?
Well, I don’t know simply because I don’t see any reason to even try to go back to the classic.
Until last week I had to when I wanted to share tables across apps, but now that the beta allows it, I am done with the classic.
EDIT
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The beta is already more reliable than the classic!
