If you tap perfectly but your aim is not great, there is still a small chance that you might SS the stream. However, if your aim is perfect and your streaming is sub-par, there is no chance to hit that stream, let alone get an SS. I mean the idea of streaming is derived from the fact that there are a lot of notes close together in time, i.e. the idea of having to tap fast to hit them.
And in terms of learning to stream, people will probably generally agree to practice getting the BPM down properly before even attempting the streams.
Their importance, however, differs in circumstance and for different players, and the question itself is kind of hinting at that fact, that subjective opinion on what is "more important." I think we can all safely say and agree that the idea of streaming comes from having to tap/click fast, and that's literally it. The rest of the discussion went on to argue what's more important, and as stated there's not really a true answer as it depends on circumstance and player (i.e. how much of each skill is required for this particular case varies).
I would also not put statistics into this as even if statistically less aim is generally required for most streams we see, since some cases are without a doubt more focused on the aim aspect.
I feel we agree on a similar premise, but are now blindly arguing about something completely different
like man, y heff to b med? jus' pley gema.