I can only speak for myself, but when I saw 1A for the first time, I was like, “Yeah, I gotta learn that.” When I saw other styles, I just wasn’t as motivated. 2A seemed to me as “just a bunch of looping” (learned later that it’s actually rather rich in technique) and 5A seemed like an extension of 1A. Learn 1A, then add a counterweight and continue to grow.
At this point, even though I understand the benefits and joys of 2A and 5A, I’m still really having fun learning 1A. I don’t feel the need to branch out yet, because I haven’t had a 1A roadblock yet.
I suspect that a lot of people are similar… want to learn 1A first… and find 1A so rewarding that they don’t want to divide their time and learn something else concurrently!
If those who start with 1A decide they’re done with yoyoing in general, they might just not get around to 2A or 5A. So first you need a dedicated player (who doesn’t just drop the hobby altogether when they start finding 1A ‘boring’) and then that player needs to have a reason to branch out (acquire new skills, have a different kind of fun, reclaim some excitement).
I will inevitably do some 5A. But since 1A is still exciting and rewarding for me, there’s no reason for me to do so just yet. That’s not a judgment about 5A’s worth, but rather a simple fact about how I’m enjoying my yoyoing time right now.
2A will be even further down the road. I don’t have confidence in my ability to use my off hand and I don’t have the space to practice effectively. And while I have grown to see that you have to be a boss to play 2A, it still doesn’t inspire me the same way string tricks do.