Honestly, it's a hard thing to balance. There's nothing more annoying than inventory Management especially when there is so much useless junk that I'm managing. Multi-select would certainly make it faster and less cumbersome.
I think an Auto-sell or auto-send to camp is fine with limitations. Maybe it is restricted to certain areas so encumbrance and even picking up useless junk has some meaning and purpose.
For example, if in the goblin camp, it is disabled. If you are in Grymforge, it is disabled until the conflict there is resolved.
But then, if you do that, shouldn't you then also restrict fast travel and long rest? Ah! And here we go again. The debate continues. Should we limit fast travel, long rest and send to camp, or just let players play however they want? Why? Because all these things go together. If you restrict one, all the others must also be restricted otherwise what's the point?
