WezTerm has emulated tabs, not OS-native tabs. Some people will find that to be enough to suit their needs. Others will want 'real tabs'.

For example, I can select a tab in Ghostty, pull it out into its own window, and then stick it into another window. This doesn't work in WezTerm, nor can you drag them around to rearrange them (keyboard shortcuts allow this however).

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.

They mean that WezTerm doesn’t use the tab widgets of the platform’s first-party UI tookit.

AppKit/SwiftUI on macOS and GTK/Qt on Linux.

So is Ghostty a faster version of iTerm2 and it is Linux compatible?

iTerm2 has way more features, more than I realistically use, but feels slower too.

Thanks!