Currently, wearing armor effect is great. It is not just item in inventory or character slot. It must be weared. It takes time to do that action.
At similar fashion, all items could be equipped to paperdoll character portrait. Items could be strapped around body. Armor could have pouches for fast usage. Taking item from backpack should be slow.
While I understand where you’re coming from, there’s also a few issues. First off, showing items physically on the player would most likely be very hard to code in, and also be hard to run for computers.
And people are already complaining about the healing and armouring times being too long, so if you add even more time to just equipping a gun… I know a few who won’t be too happy about it.
Sounds simply annoying. Please don’t add that.
It could be added as an option for more advanced gamers.