Some games have one small mechanic that feels perfect. It is not the story. It is not the world. It is just a clean idea that makes everything smoother. But very few games copy it even though it works every time.
For me it is the quick heal system from Bloodborne. Small risk, fast reward, no long menus. It keeps the fight alive.
Another one is the ping system from Apex Legends. Clear. Simple. No need for voice chat. Every team game should have something like that.
I think every gamer has at least one small mechanic like this. Something that made the game better without trying to be big or flashy.
Share the mechanic and the game you want more studios to learn from.