if the item is the only blue item then it is unique in that sense, the ability for many manufacturers doing distinctive or one manufacture making many distintive objets doesn't make them less so

also if the distinctive element is chosen by or made to fit the one customer desire or needs its tailored, a company capable of producing efficciently more tailored products faster doesn't make each product not tailored

just making an example up, i.e. an artisan that produce three diferent products for three customers in 3 months without using any machine but he may be able to produce 3 different products for 3 customers in a month with the help of machines, still 3 distinctive products, still done for three diferent customers except faster

unless we are talking that there is real value in possible flaws created by the lack of precision of doing something manual vs machined

imho the confusion steems from the use of "unique", unique doesn't necesarily need to mean better, it just mean the only one with a particular feature or distinctive element, if a customer prefer that over products mass made to be exactly the same is a choice

the real "uniqueness" is something artificialy added to promote desirability and increase value, we had diamonds sold as expensive rarities, of course they aren't, and used to be that the most perfect the rock the most valuable, now we can manufacture better quality diamonds than nature, suddenly natural diamonds are being advertised as "better" for being natural with their "unique natural flaws"

however tailored add value, it can mean something done to one's specs or needs, anyone are going to chose always something that works for them based on their needs or personal choice if they can aford it than something mass manufactured that works ok for most but will never be able to fully meet every individual needs