Your rule of thumb is nonsense.
I have worked for many years in software development. I am not a Registry expert but have done a lot with Registry.
So to classify changes and repairs just as "fast" and "Deep" is by far not enough.
Would you buy a car when the seller just tells you "The car has great features. If you don't understand motor technique stick with your bicycle"?
Or if you want to buy a computer and the seller offers you a "normal" and a "fast" model and he tells you "if you don't be familiar with computer equipment take the simple one"
It is dissappointing that WiSe does not even try to list some of the advanced "deep" Registry repairs.
A smart way of showing differences between "fast" and "deep" scan would be to let the user do a "deep" scan analysis at first and mark in the result list the "fast" repairs. This way the user could distinguish between the two repair items sets.