In the X-Plane world, there are two main scenery creation apps: Ortho4XP and World2XPlane
The rationale for keeping apps like that separate is content licensing and target users.
Lots of people need to use an AeroScenery / Ortho4XP type tool as orthophotos can't be redistributed easily.
Cultivation / autogen, on the other hand, can be redistributed. In the X-Plane world it very much is with certain sites providing high quality pre-made autogen for many parts of the world. There's no need for most X-Plane users to bother creating their own autogen.
After giving it some thought, I feel like cultivation generation is always going to be a power user feature, with regular users just downloading pre-made cultivation.
With that said, to generate my cultivation I built a homemade tool call Cultivation Compiler. It's a re-implementation of World2XPlane for Aerofly.
It's not ready for prime-time yet, but I hope to release it at some point this year (with a GUI).
A GUI wrapper around Scenproc and OSM2Object would definitely help some people out, but I just can't take that on personally at the moment.
(Unless someone hires me to work on this stuff full time )