I feel the same about tire rotations. And costco does this. If all 4 tires are the same for wear by tread depth, what is the purpose of changing their positions?
They almost never are. Even if you have a *perfect* alignment, and the center tread depth is the same, front wheels tend to wear out the edge of the tread more... unless you only drive in a straight line.
If my old tires were wearing evenly, I don't get an alignment done, but with new tires I do check for even wear often, to double check that I still don't need an alignment.