The only thing I can see where you might need to learn other parts of the software in Blender to render things is the compositor and working with nodes. Especially now in later releases nodes are becoming a bigger part of the overall thing. If you render with Cycles, you'll need to learn some node setup in the compositor if you really wanna speed up the renders. Especially if you don't have a optix gpu. You'll have to use the Intel openAI denoiser in compositor as well as some effects that can be done there. Create lens flairs, lens effects and everything can be done with nodes there.

The model corrections can be done any modeling software, so people don't really need to know how to model in Blender to get those problems solved. The shader system is the only other sticking point for rendering in Blender. If I export something form Daz, even with the best plugin there might be shader stuff that need to be manually adjusted for the best renders. That is double true if you wanna render with eevee it seems. Most of the plugins can optimize the shaders or convert them from one shader tree to another, but eevee isn't always compatible and requires special shaders and settings to do certain effects like glass or whatever.