Should we be able to alter our sims' facial expressions?

Yes. How I raise my brows would not look the same as how you raise yours. This is still a big dream of mine, TS4 uses a blanket animation which makes all Sims look the same. But one brow bone would work differently than a different brow bone wouldn't they? So, someday I hope Maxis will come up with a new creative tool that allows players to set how those animations work across many different face shapes, how a lip would curl and or wouldn't curl, depending on the mouth shape etc. This really bothers me about TS4...they all smile, use their eyes etc. the very same. This doesn't seem to be the case in the older games or maybe not as evident in older games. Bone structure of a face and how someone uses their eyes and mouth etc. would all be different from one person to the next so someday, I hope this is possible again. TS4 has the same cloned animation types for all Sims making them all even look the same. Shape of face, mouth, brow and eyes ll move the same in TS4. One smile you have seen them all.