Alpha doesn't seem like it fits so well with the over all art style of the game. Looked like it somewhat belonged in the Sims 3, but 4? It stands out too much unless you rework just about your playable households and the townies so it just blends in. Too much work for me. There's a lot of pretty alpha hair I've seen that look real nice and some can fit into the game nicely (actually have like two in game I can't seem to part with), but everything else? I just can't do it.
Most alpha clothing feels pasted on, like the clothes are wearing the sims sometimes. Though I know a lot of people like a more realistic look to their game for personal preferences.
Use to use alpha long time ago like a LOT, but switched over to MM just for the Sims 4.