All good points.
I think the challenge is not getting wrapped up in the accumulation of drills at the expense of the actual skills the drills were intended to convey. I started properly in FMA in 1989. In the time since, I've been exposed to hundreds of drills. And in the earlier years, I was always scrambling for a notebook or whatever to record them all. But, given the sheer number of FMA styles now, you'll drive yourself absolutely mad trying to record them all. It was bad enough trying to do that pre-internet, when we were picking these things up from seminars or instructional videotapes. (Panther Productions, I'm looking at you.) Now, when there are literally thousands of them at your fingertips on YouTube...
You can definitely cluster your efforts around a smaller set of drills. The obvious ones are the sumbrada box pattern, hubud lubud, and sinawali, just as an example. When I was actively teaching, I definitely used these. If I were to go back to teaching, I think I'd want to do more freestyle drilling, in addition to these set exercises. But that was always built into our progression anyway. So there's nothing new in that idea.
As one of my grad school professors used to say, "the map is not the territory." The drill is not the skill. But having that map does help a bit.