Interacting with merchants was actually enjoyable in BG2. Like I remember feeling reasonably excited to pay Ribald a visit, pretty much every time.
Buying and Selling things in BG3 feels like a chore and not just cause the click doesn't stick.
I don't know why they aren't referencing the earlier games with their interface or the nuts and bolts there, so that BG3 looks and feels more familiar to people who played BG1/2. Even down to the basic layout of the menus they could be doing things to make it organizationally closer to what we liked about the old games.
I also found the trade/barter thing weird, like ok are we supposed to haggle in dialog? Nope, just take my money for free? It was also more interesting when reputation and temples played into the buying/selling mini game.
They have a lot of work to do, like so much work