Talk of pure boxers reminds me of the idea of 'Authenticity' or 'Selling out' in music. It is very subjective and one man's pleasure is another man's poison. There is a solid deep history now of techniques on which to draw and the ability to at least always have an alternative or plan B in one's arsenal often seems to be the deciding factor. Not a 'Plan B' hatched by the coach but an innate flexibility and ability to be able to improvise on the spot in the heat of it. Outside fighting is effective but very one dimensional if you are being negated and the other guy has you tied up. Alternatives are not only essential bit the ability to move into them fluidly is what gives you that space, that opportunity to make you style count.