I think the Ratuken notice is up there for 2 reasons. For example, if people read this forum, where excited new Shig owners extoll the fabulous finish of their knives, people might imagine that when they get their own that it'll really knock their socks off too, and it might for some but might not for others. So this is similar to what's been said, especially if people aren't used to handmade items and have unrealistic expectations. Another reason I think is that perhaps the Ratuken seller has had a tough experience or two with foreign customers and complaints and so is being really cautious. Logically there should be a lot more sellers that operate directly out of Japan, but due to the language and cultural differences, and also because Japanese can be quite sensitive and want everything to be 100% correct, I think few do and those who might are also hesitant or cautious about how they go about it.
As for imperfect Shigs, I love the d-shaped handle on my gyuto - knife bought from Japan - but it was fitted on the blade at a slight angle. It bothered me a bit at first because it wasn't 'perfect' but it's hardly something anyone would notice and it does nothing to change its performance, and so I don't care anymore.