I’m speaking purely from experience here, so any Rolento experts can correct me on any potential misinformation I’m about to spread.
I think it’s mostly because it’s not that useful in general? No point in using it as poke because it has poor range, it also starts up rather slow and has alot of pushback which you really don’t want as Rolento, once you get in that magic range where cr. mk connects you absolutely want to stay there. If you’re very close to them and they attempt focusing I don’t see the harm in throwing it out, but yeah the uses are very specific as you can see.