How many sets of fronts did you go through with the same set of rears, though? Two? Three?
Now you've got four tires with tons of wear left in them, but have aged out and need to be replaced!
So instead of rotating and only needing 6 tires, you've bought 8, or possibly 10 tires total, AND had to discard four tires with tons of tread on them.
The whole premise of your argument is that tire rotation is only to compensate for alignment issues, but it isn't. You yourself have admitted that the fronts wear more quickly than the rears. Doesn't it make sense to spread the wear across all six tires and replace them all with fresh rubber at once?
Quite frankly, I've seen 4x4 trucks with steer tires on the front, and they may as well not have 4x4. Worthless treadless wheels spinning uselessly on top...