Okay, I Like WezTerm

A problem I have when I see stuff like this with tabbed interfaces, splitting etc. is it's all at the wrong level of abstraction and compensating for a hopelessly deficient window manager. If you use a window manager like sway then you can layout tabs, splits etc. to your heart's content for any type of window you like. You don't need a terminal emulator to do this for you.

Given that I do already use a window manager like sway, is there much else worthwhile compared to any other terminal emulator?

Wezterm has built in ssh support where if you open a wezterm ssh window to a remote host and then open new tabs/splits within that window, the new tabs/splits are added as part of the existing ssh session automatically. It also allows you to host the session on the remote machine (kind of like tmux) and when you connect you get back all your previous tab/split organizations. From that perspective it can make sense to have the terminal own the layout organization.