I find that building in BTT is very slow and somewhat tedious. One thing that would help me is more immediate access to documentation when building. For example, see this screenshot:
If you could provide some help text on action panel that describes what the action does, what data it accepts and what data it produces it would be much easier to come up with new solutions. I love BTT, but I avoid making anything more than one action long or using new actions. I think most of my hesitation is that it's too obscure and if I'm not working with it all the time I forget how to make things happen.
I know documentation is much harder than it seems and also not immediately rewarding to users. But over the long run I think the kind of people that build with BTT would make a lot more things with it.