I'm honestly not sure what a OS native tab is supposed to be, on Linux. And I do not see why "emulated tabs" of WezTerm couldn't just do the actions that you describe. The Firefox tabs do after all, and they do not look like they are built according to some (GTK?) tab standard (GTK.Notebook?). I'm pretty sure that X11 does not have native tabs, while some window manager do. Is there a linux standard I'm just not aware of that you are referencing here?

Maybe it does not matter, the difference in functionality should count. Just highlighting that this messaging might not be understandable for linux users. I guess you are talking about some macOS thingie that's irrelevant to us.