I've always loved Lightzone's Zone Mapper - which is based loosely on Ansel Adam's zone/tone idea.
The idea is extremely intuitive .. but. the execution has an efficient and productive UI.
Despite having used Adobe Photoshop, GIMP, Krita, Affinity Photo, etc .. I still keep the free Lightzone installed for the zone (tone) mapper.
(I also love the very easy and intuitive shape tool which acts as a mask for applying any filter or operation .. with adjustable non-destructive shape and edge transition)
Here's a set of video tutorials https://www.youtube.com/watch?v=xq1tyuZXbpo&list=PLUECp8xv0O0DPqRL8Qgrs6ZQVVvrGfZPP
I really wish Affinity did this .. instead of the less intuitive set of filters which seem to have a high barrier to expertise .. and seem very inefficient in terms of desktop real estate ... their retained settings are counterintuitive.
Just honest friendly feedback.