Well SVT this is a very debatable answer and there really is no defenant answer....it comes down to what the individual person wants.
The problem I have is that you HAVE to go on 28inch slicks/sticky tires. You cant just run down there to see what it will do in 100% street trim. I dont like limits at all, so I guess that would seriously bug me. I like getting real world times and all out drag times, and kinda compare the 2. I think alot of people feel the same way.
HOWEVER if your car only sees the track in full drag trim, then sure that method would work...or if your car is drag only. Im not saying that it doesnt work, or that it isnt used....but its mainly used on racecars. There are more reasons than they dont want to change out there rear gears.
1. Taller tires bite better
2. the can run a steeper gear (to help off the line) and the taller tires will grow more, effectivly making their gear ratio go higher the faster the car goes (= best of both worlds)
3. Tires will actually last longer.
4. taller tires are easier to get in super wide configurations.
But SVT it is an alternative that should be explored, depending on what the owner feels the cars purpose is, and how he/she wants it to be. Options are always good.
(and I wasnt trying to insult you with the mud tire thing, just trying to put out an exaple so people could easily see my position

Sorry if it did.)