If you use Denoise or Sharpen on a layer couldn't you use blend-if and protect the shadow areas?
Yes, but :
1) it shouldn't be necessary with Denoise (especially) when the image has moderate amounts of noise, to begin with
2) if obe uses a plugin to do the job, it shouldn't be necessary to use another application to finish the task.
Sharpening could be a bit different, but would still benefit for workflow reasons if everything could be done within the plugin. Another thing they could add, if that works well with the AI, is an Apply button, which would allow doing multiple runs on the same source image without having to save and reload the intermediate results.
All of these have been requested by beta testers, so over time it might be added, we'll have to wait and see.
Cheers,
Bart