Since I don't use the gallery for sims, I voted that I don't care because ultimately, this isn't something that affects me.
However, if I were someone who did frequent the gallery looking for sims to download, the custom poses would annoy me. I think what a lot of people don't realize is that part of the process of making these poses is literally editing the base sim mesh, moving the facial bones wherever the creator pleases without discretion. The faces are manipulated in a way that you will never see in CAS or in the game, so you're being presented an image that is different than what you will actually get. Sometimes the difference is only minor, but other times it'll be worse.
The default poses might be kind of goofy and cringy, but since that's the way the sims look and act in the game it's a lot more fitting. They present what you will actually see when you're playing with that sim.