Tell me if I'm alone in this: I feel like the most rewarding, intense and interesting gameplay situations happen when I choose to deliberately deploy with a limited loadout. That is to say, instead of just going with the latest version of every single piece of equipment available to me, I'll limit the number of items I'll bring along, the GMP cost of that loadout or the types of weapons I'll use.
That will usually put me in tough situations that force me to get creative or to be extra careful and that does wonders for my immersion. Pitch Black, the first mission in the second map is one of the most memorable game missions I have ever had. If you look at the mission, it's nothing special. But the situations I found myself in during that mission, the solutions I thought of, the state of mind I was at made it incredibly exciting and rewarding.
In the end, I feel like I enjoy games the most when I don't approach them with an "Impress me..." attitude and actually work with the game collaboratively in order to have fun. To me, for MGSV, that means artificially capping my loadout options and other things.
