MAF/airflow data is used in determining spark as well...and various other parts of the tune. Raping the PE table to bring the fuel inline means you're also hitting the wrong part of the spark table, and then you have to tune that too...it's really amazing how quickly the whole tune comes in line when you get the MAF and VE data correct.
Not to mention...tuning the MAF table when you have the wideband feedback coming into the software...is as simple as clicking copy and paste...and if you know how to setup the scanner to tell you the VE table based on the MAF, building the VE data correctly to match (for proper blending and redundancy) is as simple as copy and paste, then clicking "Generate Equations", and then copy and paste again...it literally takes seconds. Then when the weather changes, the spark/fuel corrections work as they should...when the fuel changes, the spark/fuel corrections work as they should...when you decide to try changing fuel compositions, it's as simple as changing the stoich AFR value (or hooking up an alcohol sensor and letting it do it itself).
If you don't know how to do it the right way as easily as it can be done, don't tell people to do it a hacked way while also trying to defend it as the best way.