Not exactly.... kickboxing and Muay Thai are completely different animals. Theres no "whats good for you" in Muay Thai really. You will not see anyone with their hands down in a professional Muay Thai fight period (unless way out of range...even then not common at all). Kickboxing is something else altogether. There is no trial and error in Muay Thai either, the Kru is constantly on your case to keep your hands up which is why the originator of this thread asked why it was so damn important because obviously his Kru is nagging and nagging him to keep his hands up up up! It is annoying to be constantly badgered to keep your hands up but theres good reasons for it, some instructors are hard core and if your hands are down they beat you in the head with a stick until your hands go up again. People with their hands down can die. Like I posted earlier they arent aiming the high shin kicks to the head, they are aiming for your neck! My friend fought for a few months in Thailand at the pro level and when his coach would hear "kick him in the neck! kick him in the neck!" he knew to scream "keep your hands high!" to my friend who would happily comply knowing what was coming. When he got tired the hands tend to drop slightly which is when the opposing coach would call for the neck kick to take advantage of that weakness. His hands are still covering his head but when they get lower (from fatigue) the blocking power is lessened and a good shin kick can tear right through your guard.
The reason I say there is no trial and error is because Muay Thai is fairly regimented on how to stand, how to have your hands up, how to kick and where your hands go when you do etc.. and its all because of years of ring experience. You don't do it a cetain way your in big trouble. It's been proven time and time again so they know the best way for Muay Thai. Things would be different for anything else. It's just a huge no no to not have your hands up to a certain height in Muay Thai.
But your right, maybe the poster of this thread should just find out the hard way. I personally like to listen to my Kru as I figure he knows whats best for me and has my health and welfare in mind.
Damian Mavis
Honour TKD