The main thing I came away with from systems other than D&D was the ability to be more narrative focused.

What makes a character unique? Your skills, abilities, and where you’ve dumped various points like in D&D? Or the narrative focus given to what your person can do and their backstory in a system like Lady Blackbird with its tags and keys?

I wish there was something just as popular as D&D that offered a roughly equivalent experience but based on the less crunchy, narrative-driven approach to TTRPGs that could be a sort of “Bad at math? Give Dangers & Debates a shot!” to catch the people who get mired in D&D twin-strike ranger hell from thinking the entire TTRPG genre is combat encounters during which they’ll either shoot one thing or two things.