I think that Wadjet Eye Games studio still uses AGS for their games, and most (all?) of the games published by them seems to use AGS as well.
I highly recommend checking their catalogue. While the first installements of Blackwell series didn't age that well I still think they are a quite nice starting point – they are short and memorable.
Yes they still do, and fun fact, SummVM has integrated support for AGS a few releases back, so one of my favourite titles from Wadjet Eye Games, Unavowed, works great on a ton of different OSes/platforms.
https://wiki.scummvm.org/index.php?title=AGS/Games
I've played it on OpenBSD before!
Yes! my love for The Excavation of Hob’s Barrow is what led me to AGS.
Gemini Rue is probably one of the best game stories I have ever seen. What Joshua Nuernberger did there is amazing. The "twist" that occurs there in the final third is something else. And it's built using AGS.