From my memory the usual behaviour used to be:
For point 2. the outcome should be the same, but for some reason they are now different.
For point 1. Given that Business Rules don't let you hide Sections or Tabs, the Tab should be Hidden.
As a workaround to hide tabs and sections, you can also use the Client API:
For Tabs: docs.microsoft.com/.../setvisible
For Sections: docs.microsoft.com/.../setvisible
Indeed, the behavior in the Unified Interface does not match 100% the legacy web client, and you have highlighted a case where visibility rules for sections and tabs are not exactly the same.
Is that breaking a particular scenario in your case?
If that is the case, have you raised that point to support?
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