I can’t say for anyone else, but Karlach is hot because of that infernal engine she has for a heart. :P
Why can’t I sort or filter items during trading or in the party view?
You can on a controller. Press in the left stick. The fact the UI between a controller and the M&KB is so completely different and you get dumb differences like this is another amateur hour move. I’ve played entirely on controller, but from talking to other people and seeing my sister play on her laptop, the M&KB interface is garbage and offers for fewer options far some damn reason.