I love this post! I admire your philosophy of preservation and being "agnostic" with the engines you use. I link to engines like RPG Maker, including Paper Maker, mainly because story-focused games and RPGs are my thing. And engines that can be used without knowing code are also my thing.
I've tried a lot with GDevelop, I didn't manage to do anything finished, not even something halfway, but I tried hard to use it and I learned a lot of new things! In the future I would like to take my time to learn even more about the engine and make something there. It's also worth mentioning, or so they say, that the mobile ports of GDevelops games are not bad... You can even use Gdevelop from your cell phone! It's on Google Play Store.
I tried superficially Pocket Adventure and Decker, I liked them. I'd like to make stuff there too. My mind is already making several ideas on what to do on those engines after experimenting with these. We'll see in the future, I'd better not stick to a single engine (or a series of engines, like the RPG Maker series).