Gallery could use some good updates, but I'm glad its there regardless, and I hope it or something very similar remains in future games for the series.
My most unpopular opinion on the gallery is that CC Sims and MOO builds should be in seperate sections/tabs entirely. MOO glitches builds (especially when people don't use it properly and/or overdo it) and I'm not even sure what the point of putting CC Sims on the gallery is, since none of them even come with the CC itself, lol. But for similar reasons, they should have their own section/tab. For someone like me who doesn't use CC at all, nor wants any Sims that glitch or look super different without it, this would just work better. The checkmark thing obviously doesn't, lol.
