As @
samerdl; said, Simba has been and always will be a fallback, the thing everyone uses when nothing else is working. Granted, Simba has a reflection library for OSRS but the very nature of Simba and the SRL community pretty much renders that point moot.
Why? Because Simba, staying true to SCAR's age-old legacy, is not a bot. I want to call it a CDE (cheat development environment) but it's not even that. It's a program that happens to be very good at playing RuneScape (with the aid of SRL/SRL-OSR). Also by definition, it's nowhere near as user-friendly as other macros. The reason Simba has always been somewhat shunted to the side is just what I outlined earlier; it's a fallback.
I'm not even trying to be rude, I myself only discovered Simba
after the bot nuke two years ago. I hadn't a clue that any color-based scriptable macros beyond SCAR ever existed. Why? Because I was sucked in by the bigger names in RuneScape cheating at that time: NeXus, RSBuddy, EpicBot, powerbot.
Don't get me wrong, I think Simba is the best macro out there, but it's just plain confusing. I don't think anyone will disagree with me on that point, at least not from the average RS player/botter's point of view (and we all know how stupid they can be).
Once upon a time, every RS cheater was smart and individualized and determined and willing to learn--but that's simply not the case anymore. And that's why Simba will always remain in the backseat.
Which isn't all bad! We have a great (albeit close-knit) community here. We can accomplish the same tasks in manners that other cheating communities cannot.