I'm against moving like a boxer while doing kung fu because if you are fighting against someone who knows what they are doing and understands how boxers move, then you are get kicked and kneed. If the person who is doing kung fu isn't good at using kung fu then by all means move like a boxer. This is not an either or situation. It's always in the context of who you are facing and the skill level of the fighters.
here's an example that shows both points. It highlights the the Muay Thai fighter keeping his distance, It highlights the boxers ability to move, and the boxer moved so well that the Muay Thai fighter decided to pick him up. The movement as a boxer worked well against the Muay Thai fighters punches but put him in a bad position which made it easy for the Muay Thai fighter to take him to the ground.
boxing vs tkd