User blog comment:Uraharattack/King and his Haki/@comment-124.171.141.43-20190124040429/@comment-2600:1702:3C50:A6E0:CCA0:FEF5:FAD4:3BBA-20190124055658

Those who use full body armament seem to fall quite easily. Maybe it is better to concentrate ones haki into a single part of their body rather than trying to cover every centimeter. I cannot imagine that using it in that way would help them in a prolonged battle with someone who is their equal since that would likely use it up faster. I think that Luffy ignites himself through the properties of his body while Sanji uses a similar technique to Wanze in order to ignite his feet. Just my opinions.