Yes, it would be great to wear the kilt all the time, Hamish, but despite it being a great mode of dress at times it is not appropriate if you are actively engaged in everyday tasks at work and at leisure.
Although I have worn it for days on end, it always been when my time has been my own and not doing any formal work or pursuits, perhaps I look on the kilt as something that I can put on when I want to relax and have that great feeling you get when wearing it. It could be that continual wearing of the kilt could dumb down that feeling and belonging to an extent that it just is another garment and not something special.
By saying this I will be at odds with constant kilt wearers whom I admire greatly but I think that we are all different and have different views on when to wear the kilt, for example, in very hot weather I prefer to wear shorts which I think are far more appropriate than a lightweight kilt but then we know that some x-markers in far warmer climes than we have in Scotland would totally disagree with this viewpoint.
But I do stress that I would love to be in a position to wear the kilt all the time but I do not have that luxury