Pushing reversal films is achieved by essentially fogging the film so that the color Dmax is decreased by the increase in first development giving fogged silver that does not give a dye image. There s thus a reduced Dmax in the final color image which gives what appears to be higher image speed but in reality is no speed increase at all. If the layers are not perfectly balanced, then the image can shift color, have color crossover and often will give very poor results.

Of course, it also changes the mid scale contrast and the grain.

So, given what you have said, I would say that the user must be the judge of what is acceptable for them and I would advise them to proceed cautiously on this.

Also, you have taken part of the line from my post out of context which changes its meaning somewhat.