Yet we have other artists who fight in a similar fashion at an equal, if not superior level who don't train in kata at all.
If Muay Thai and Kyokushin look similar during combat, what's the point of Kyokushin's katas if the end result is looking exactly like a kickboxing style w/o katas? Couldn't you simply bypass the katas entirely and still perform high level Kyokushin?
People like to train in different ways, some are visual learners, some can just be told how to do things. Others will take weeks to learn one technique as they like to pull it to pieces examining every nuance before using it, others have an instinctive appreciation for techniques which means they can do them after being shown just once. The end result will be the same but we all gravitate towards a style of learning that suits us so why worry about some who do katas when others don't. It's a choice.