It’s a case of diminishing returns. Shooting raw is a huge and obvious improvement if you want to post-process in almost any way. Conditional on that the workflow should be as smooth and simple as possible. Abstract controls like "clarity" are fine if the result of adjusting them is tangible and almost always does what you want. Giving the user lots of knobs that hardly have a visible effect (let alone a desired effect) is not an improvement.

Almost no professional photographer will care about the intricacies of the demosaicing algorithm, or the choice between a dozen different denoising modules, and Lightroom is entirely correct in not giving you a zillion knobs to adjust things that have no effect on image quality except in the rarest of cases. In 99% of cases the controls that matter are:

* Basic exposure/shadows/contrast etc

* Curves/levels for more control if needed

* White balance

* Cropping, obviously

* Cloning/healing brush

* Simple knobs for sharpening and NR

* Level/perspective adjustment

* Lens aberration correction (most of the time no manual input needed if the lens is in the batabase)