Red Dead wasn't even a 2020 game. Shouldn't have won!
Definetly not for everyone but I found it immersive, unique and addictive. In fact I've played for about 90h (my 3rd game for hours played this gen, after BOTW and Rocket League).
Although it was a bold move to give it so much weight in the overall gameplay experience I think its "walking machanincs" are definetly something every open world game could take a note from. It's the only game that manages to make interesting a "boring" task (carrying an item from point A to point B).
Also, I have appreciated how they implemented stamina and fatigue.....In fact I would like a similar system to be implemented in an ARPG title like Dark Souls (for example).
Lastly, the way you can build infrastructure to facilitate traversals gives it a sense of great (but slow) progression.