They need too add that you can choose multiple Gear that you dint want or need and sell them at the same time
The Grammar Nazi in me is crying in frustration at your title. But I do take your point - it would certainly help to be able to trash multiple items at once.
I would still sell every item one by one. I don’t want to misclick and sell a row of good items.
This is really not a problem at all. I just go to the command screen after every mission, check the new gear, sell the unwanted ones and I’m good to go in 15-30 seconds.
It’s not an ARPG game where loot just drops all over your face every second. And if you need to choose, then you really save like several seconds anyway.