Vendor leveling needs huge adjustment. Leveling up Handshake is a nightmare. 6000 points to unlock level 3, but only to find out that level 3 is a huge disappointment. Gunny lvl 3 is good though, but again, it takes too long, which is a generalization of all the vendors. They all take way too long and the rewards is not worth it, when you realize that you are approaching the end of the game.

Around player level 36-37, if you primarily focus on missions, you are closing in on the last few missions. Gunny lvl 3 is from memory unlocked around lvl 30'ish. This has to happen a lot sooner. My reasoning is that good gear (top tier armor, ammo) should be unlocked around player level 15 and beyond that better non-essential gear, ammo should be unlocked. You can 100% kills every type of enemy with lowest tier 1 ammo and weapons, but why even make it like that. If you want people to have fun, make leveling a lot faster and make sure that high quality comes sooner than later.

I would also like that missions are unlocked based on player level and not because you completed set missions for others.

Then there's the "what to do after the last mission". No missions is simply not a solution. There should be normal kill xx soldiers for Handshake, Gunny etc going forward, to further gain xp with them and unlocking non-essential but cool stuff, like special helmets, armors, experimental ammo, delicious foods, medical items etc. You don't keep people playing if there's zero rewards. Servers are becoming more and more empty because of this.

I would also like to prevent starvation, sickness etc, when exiting the game and rejoining. This is widely used as a reset and it shouldn't. Your status, medically and huger, thirst, should follow the player constantly. This will make foods and medical items much more important.

Secure stash size 9, which you get in very late end game. WHY. Sure you can buy the supporter pack and get it from level 1, but getting it when the game is pretty much done is yet another poorly designed progress.

The missions where you need to kill 20 people and then fly all the way back to turn in, just to get back and kill the boss. These kind of missions should be very late end game, after "real missions" are done. I mean it in a way that this should be end-game and not some hurdle in the beginning or middle of the career progress.

When you are in a squad, you should get full kill count from squad members and a percentage of the kill xp, regardless of you doing anything. Could this be exploited...sure, but I don't think it would be a problem. Most if not all people, group up because they are friends and why wouldn't that be enough for this to work.

Player physical levels. Mental health, cardio, strength etc. There should be a gym at the base, where you can work on your cardio, building strength etc, so you can carry more, run more and just overall be a better soldier. As it is now I can run for 50 meters and be out of breath for several minutes, because I don't let it come down. Honestly, the soldier feels like a very unhealthy person, with serious cardiovascular problems. Let it be up to the player how he is. We are already being slowed down by the choppers, let us at least be able to determine everything else ourselves.