Some great points p4, but I also think that you may be giving Aitor more credit than he is worth (or maybe even asking for) in some respects.
His quote about artists and designers is one of the things about his manufesto I wish he worded differently because to me, taken in context with other interviews he has given and how he works etc. he is obviously speaking only about himself (or at a stretch his team). His more "artistic" side comes up with an idea which he then puts down in sketches and he spends a lot of time refining and exploring and then as a "designer" he then spends yet even more time figuring out how to not only tie in the original idea with functionality, but also how to make it an actual physical object someone can wear and not be hampered by. Remember he started all this by drawing a lot. I guess he found a way other than comic books to monetise that particular skill set.
Aitor is very different from Massimo Osti or a designer like Errolson Hugh for instance (at least when he is working on New Object Research related items) who are thinking about actual users. I see Aitor more like a superhero costume designer that makes the clothing in a comic book available to buy. "Doing something different" is enough for his conceptual framework I think.
It is like the most luxurious cosplay ever. Lol.
As long as the piece works within the narrative context he originally developed, then it is justified. In a way, his entire business brings him right back to being an artist (in the sense of art not necessarily having utilitarian value) than a product designer. He has just found a way to express himself and he has developed a framework to sell/share that vision to/with people.
Sometimes, I think he might have been better off with solely private clients, making items on demand based on his archetypes instead of going RTW and doing exhibitions regularly as I feel he may now be in a precarious position where the hype may die down and he will not be left with enough customers to justify the retail model (unlike a designer like CCP who also makes crazy art pieces but can still make retail viable by making boots, pants, leather jackets etc that can be easily worn without looking too sci-fi). Who knows though? He may end up with a good core of clients picking up stuff regularly.
As an aside, while I only own the shiva bag at the moment, I think that part of his whole process is trying to find a middle ground between his conceptual narrative and everyday use of an object. I use the shiva bag almost every day for example and it's being shaped like a skull does not get in the way of my using it, not to mention the addition of multiple straps givin me options for carrying it around (even if those straps were added to allow me to cosplay Shiva literally if I had more of the bags).
The pieces will work for their intended purpose and the "resting state" for most of them look pretty okay. The saxophone suit for example does not have to be worn with the sax case on the back and if cold enough to warrant it, one can take the time to assemble the scarf and move around like that and be protected from the elements. Of course one could argue that he could have gotten the same effect without all the extra construction and design time taken to stick so obsessively to his design manifesto, but the same could be said for a lot of other designers (maybe not to as crazy an extent, but still) and he would not have his "hook". I know Yohji pants could be a lot cheaper if he did not use as much expensive fabric as he does and cut to a less particular pattern, but that is part of the charm, no? That effort has no function beyond the aesthetic.
I do think items like the Stockwell tshirt and jeans and so on are a bit redundant, but he strikes me as the sort of guy that is super particular and must follow his own manifesto to the letter so they "needed" to be created, but yeah...
I also think the website could have a better UI/UX, but overall it took only a few minutes to adjust to and the content is S rank