Wait, what? ptyxis is not the default GNOME termjnal. It is the terminal of choice for both Ubuntu and Fedora, but the default terminal in GNOME is Console, internally known as kgx: https://en.wikipedia.org/wiki/GNOME_Terminal.
I was using GNOME Console in a postmarketOS install in my Chromebook. The fact that it is lightweight compared to say Ghostty (my main terminal everywhere else) made a difference in performance for such a constraint device.
And I didn't really miss any features to be honest, it has the basic that you expect (things like tabs). It is less customizable than other options, but the defaults were good enough for me.