Where did you extrapolate this info from ?
Feature request and forum post in general, but this is presumably as I wrote. And "voracious power users" was a ironic term - just in case. You want something else (actually "more", not else) because sooner or later you reach the the limits/drawbacks of simplicity (adding elements or exposing parameters to UI does not necessarily mean to complicate or "clutter" things anyway).
Good Luck
Request often come from victims of Stockholm syndrome.
Vray recently kept removing and removing. Their only one year old feature (Minimal Shading Rate), which made scattered samples into single parameter, is already worthless as well, because they implemented fully automatical sampling. 2-step simplification happened here, while the software grew in robustness.
It's about 95perc. perfect, so nothing absolute. But does those 5perc. case warrant fiddling ? For small minority of user, yes, perhaps. But it mostly warrants another automatization improvement.
You don't simply reach a limit, it just might be progressively harder keep things simple. Yet it happens in Corona constantly, and succesfully. UltraHDCache is more advanced, yet fully automatical. Before we had threads full of people asking for what settings to use thee.
Corona should not switch philosophy midway because it runs into small issues.
Rawalanche's suggestion to test adaptivity so single best parameter can be adopted, is much better than exposing the parameter, which would just lead to another headache of adjusting it per scene.
I honestly don't even touch GI/LSM anymore, even with more DOF and Motion blur, I don't see big difference to warrant fiddling with it. In time when my image is ready, they all converged almost identically with no benefit whatsover.
Artistic/Creative clutter (Framebuffer), that's another thing which is positive :- ) But not exposing more internalities. The first UI concept (by Raw) presented on previous page is fine imho.