Probably exaggerated a bit with that phrasing (“outrageous” seems similarly hyperbolic ;))

But any variable which I’ve not already marked as const is pretty much by definition going to be modified at least once. So now instead of 1 variable name you need at least two.

So now the average number of variables per non-const variable is >= 2 and will be much more if you’re doing for example DSP related code or other math heavy code.

You can avoid it with long expressions but that in principle is going against the “name every permutation” intention anyway.