Implementing a send everything to camp button and item multiselection must also be insanely hard and "experimental" for a 2020 PC game. Don't forget this is a game that can't even pause in ESC menu screen. Definitely AAA vibes.
But that's not DnD. There's no "send everything to camp" option in 5e rules. It's amazing how fast you'll sweep that argument under the carpet, isn't it?