Of course road strip spikes is a near exclusive to Vice City that's not returned as a fan-favorite, but what other aspects about GTA V you feel got neglected or should become staples of the series?
I recall discussion about getting in and out of locations previously by switching to an outfit of distinction, or special vehicle that allowed gates to open, I was seeing electric gates are still a big part of GTA, including this one, and we mention getting into restricted areas. Why not by using capabilities as before with a police or army outfit, this is part of the fun we had in RDR as well, but without Multiplayer XP, you usually got the good stuff at the VERY end of the game! It didn't come in as handy as it did in Multiplayer, suffice to say.
Another thing I hope returns is metal detectors for weapon storing so you can outfit yourself with a different round of weapons in selective slots, they do away with this somewhat with ability to keep weapons but only have ammo confiscated.