They are enabled to (also) run on phones.
E.g. libadwaita makes it possible to write application which can adapt to the screen size and therefore run on big and small screens.
Yes, they are mine. I guess the question is targeted if they are done on a mobile device. The screenshots are done on Fedora Silverblue Gnome on a Dell XPS 13 laptop developer version (~7 years old).
But I also have the Librem 5.
You can put the newer apps in a 'simulate phone screen' mode (it's still in development).
You sure did. Maybe libadwaita even includes tools to make it easier or something, I don't know. I just think maybe the toolkit that breaks everything all the time isn't the best example.
Call it hate if you want, but it is an intentional design decision to break compatibility with other DEs. That is a choice they consciously made and have been very clear in communicating. There are trade offs involved. I'm not saying it's a completely irrational choice or anything, but it is aggravating for those of us that don't use Gnome when we have to deal with libadwaita apps. Libadwaita is designed from the ground up to be a Gnome exclusive thing. It is not for Linux. It is just for Gnome. That is the developers' stated intention.