I think for me it was less about simple mechanics, but the idea that D&D isn't just "storytime", but a game to be won. I play OSR games because I like to see players accomplish that with creative solutions and role-play. For other rule sets, I think it's cool to see players do that via smart character builds, clever battle tactics, and/or meta currency manipulation.
5e for me, especially behind the screen, just felt like the math wasn't mathing. Past level 10 I gave up trying to balance fights all together and just let them live out their super hero fantasies. Much happier with PF2e right now since it seems to be a great combination of role-play/tactics in order to overcome challenges.
That picture of Strahd is absolutely gorgeous. I honestly did a double take. The last promotional Ravenloft artwork I saw was this:
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So certainly took note.
Honestly, all those others pics you posted look pretty great too. I was so turned off with the Player's Handbook I never even gave the other books a look through, so glad to see this. I've only seen the Player's Handbook out in the wild, but I will certainly give the other books a flip through if I get a chance.