Very interested to see where it's coming ! Libadwaita or not (I'm a bit biaised for libadwaita as I'm a GNOME user, but in all case if there is cooperation between different player in the space everybody will win !), a new WebkitGTK browser is interesting, the landscape was a bit barren since Midori became a Firefox fork (there was Ouch, an Arc Browser clone, but it doesn't seem very active anymore)
hawdini Looks like it's the opposite for Ghostty, the devs seem to be removing the possibility to buid it without libadwaita : https://ghostty.org/docs/install/release-notes/1-1-0#gtk:-forcing-a-dependency-on-libadwaita (but they have now a SSD setting that replace that for other desktop)