I don't know that cheap/fast is necessarily the driver here. I think that much of it is a backlash against lazy appraisal practice.
Straight "rank the subject in the range" qualitative analysis works, but only when someone actually performs that analysis.
"Appraiser's judgement" works, but only when someone actually performs that analysis
"Matched paired analysis" works, but only when someone actually performs that analysis.
"Group analysis" works, but only when someone actually performs that analysis.
"Sensitivity analysis" works, but only when someone actually performs that analysis
Etc, etc. They all work to one degree or another - but only when someone actually does it. No analytical method works when they are merely referenced in the report but aren't otherwise performed. To the extent that so many of us have not been doing what we say we do, that's why the charts and graphs crowd has been able to sell the chrome plated spinners with the 22"s as a necessary component of the Yugo we are selling to these lenders.
We did this to ourselves.