There are seven aspects of kata: pattern, breathng, combination/timing, bunkai, tight/no-tight, kiai, and eyes (spirit) - the end state if put all together is you are in a real fight and a state of "no-mind" but experiencing the fight. There has been a trend lately with folks making a living off of focusing on only one of the seven aspects - bunkai. It is important, but to practice kata from that technical viewpoint alone like an archealogist (digging though kata trying to find new interpretation) - ignores the whole point of kata to reach a mental and physical state where actions are thoughtless and instinctive. Too many people are just making up crap when it comes to bunkai - "I can block, then chop, then turn the arm over, then kick to the groin, then throw him down to the ground" - Yeah so what, anyone can do that. Better to do your kata as hard as you can - over and over again, visualize your opponent (simple bunkai); and have spirit!
clautz, welcome to MT. Perhaps you could introduce yourself and tell us a bit of your background or even put up some of your background and interests in your profile.
I would challenge what you are claiming in that kata and bunkai are quite separate and you wouldn't use kata to fight.
So let's look at what you have claimed:
Pattern or embusen. Well there might be several reasons for that but as Chojun Miyagi is alleged to have said, "don't be fooled by the rule of embusen". The turns and angles of kata are important but not in terms of the kata. They are important in the bunkai.
Breathing. Sure you can practise your breathing while performing a kata. You can just as easily practise your breathing while not doing a kata.
Combination/timing. Sure the kata is a combination of techniques and if you are performing the kata correctly the timing is important, but will you always use that same timing in a real fight? I would suggest that the timing in kata is adding to the realism of the kata, not the effectiveness of it.
Tight/non-tight. What exactly does this mean. I am going to pull on my understanding here and suggest you are talking of beginning from a relaxed state, contracting the muscles at the moment of impact then returning to the relaxed state. This is fundamentally the teaching of Okinawan Goju so yes, that is definitely a part of kata. Mind you, it is part of all the training, not just kata.
Kiai. ??? Hmm. Ok, it is certainly a big part of Japanese karate but not so much the Okinawan. What relevance it has to kata specifically, you might like to expand on.
Eyes (spirit). Um, no! Certainly looking in the right direction and creating intent might be part of kata but again, nothing that is specifically part of kata. I prefer to think of 'spirit' as Ki and there is hard Ki and soft Ki. Hard Ki involves the eyes, soft Ki doesn't.
Bunkai. Well here you have demonstrated convincingly you have no comprehension of Bunkai, which is, I would think, why
Tez disagreed with your post. But you will be among friends as there are several others here who share some of your views. They think kata is a total waste of time, both the kata and the Bunkai.
If too many people are making up crap Bunkai, it has nothing to do with the Bunkai or the kata. It is merely that stage of their understanding and development. They will get a better understanding with time. Those who remain thinking the way you do, will not.
You said,
"Better to do your kata as hard as you can - over and over again, visualize your opponent (simple bunkai); and have spirit!" I would suggest that this advice will ensure you never get past basic level karate, even though you will be exceptionally good at it.