It all depends who the referee is. If you could get away with it then there is no problem and keep on doing it. But if you get warn and keep on doing it dont cry later for deductions.
One thing you failed to notice in those boxing videos .. None of the fighter were not Running All video Haggler , holems, Forman,, were all stocking their opponent who had no place to go but up close as a way to escape punishment. Kahn on the other hand was pushing to make room to run, totally opposite of what these fighter where doing.