I KNOOOOOW!
It sucks super bad.
You get 8 people in your squadrons, and really basically just use 3-4 of them and let the others rot, especially since once you start unlocking more mastery points on someone there's no reason not to use them. Like, even if the mastery points aren't in what you'd like, the one that gets upgraded is always random so having more points nearly always = better.