I'd like to start by saying that while I do have suggestions for what I think is in the game's best interest, I am not trying to tell the developers what to do, I am only offering insight on what I believe would improve the game's quality of life.
So I would propose:
-Allowing the player to switch between "Over the shoulder" and "Scoped" view when using x8 and x12 scopes. I don't really understand why the x4 scope gets a pass, but I would really appreciate this change as it would allow for more adaptability in sniper builds and the like. I also understand that some scopes have different levels of zoom (x12-x16) but I don't think that an over the shoulder view is needed for those, as the button mapping issue could be troublesome.
-Kind of an overdone one I know, but perhaps increase stash size. I wouldn't mind having it locked behind a challenge or material requirements if needed, but I really think letting us horde more items would be nice.
-Gear mods: only letting us keep the 3 highest rolled mods of one type (like Crit chance, Armor on kill, Skill haste...) or at least highlighting them in our inventory, since we can only use a maximum of 3 at the same time anyway on our mask, chest and backpack. If this is not possible, then maybe just letting us sort each mod by highest value would be appreciated.
-Having a way to put season locked blueprints in the regular blueprint pool. For example, I missed season 3 and so did not get the hunter's fury blueprints. I hope that a way will be implemented to allow for its retrieval without needing to wait for S3 to return.
-Allowing us to tag gear and weapons for recalibration the moment we pick them up, so that we don't have to go in our inventory and do it there. I will admit that this is a very, very minor complaint and I probably won't cry all that much if it doesn't happen, but still, a suggestion.
-Bit of a weird one and more of a game mode (also probably unnecessary), but for people that simply like to explore and look at the world of the game, a mode where all enemies and loot is removed. This is probably the least needed one but I thought I'd still propose it cuz why not ?
That's about it, feel free to add more ideas in the comments if you have any, and I hope any dev that reads this will find this helpful.