I tried to read your post carefully, but I must have misinterpreted what you were saying. To your question, ‘is mass art still art?’ you wrote, ‘I think so…’, did you mean, ‘I don’t think so’?
If you actually meant that you did think mass art was still art, this was then limited to hand made work, but not limited by the amount of hands in production, nor specifically by function, so, in effect, your question was, ‘is mass art, that is hand made, still art?’. Apart from whether or not hand made art is mass art, I imagined you were actually asking about whether functional hand made work was still art, as function would also be a questionable aspect here. I felt I was agreeing with you that functional work may also be art. Now I think you are saying quite the opposite, that something that half functions, (a matter of opinion itself), can not be valued for any function and can only be valued aesthetically. I don’t see the two values as mutually exclusive and do believe that aesthetic appeal can be found in ‘fully functioning’ objects, and that this may be considered art. Perhaps you are saying that there is some desired amount of artistic or functional value required for a work, and when biased toward art, defines art?
My juicer, however, seems to be of the greatest concern here
, so I’ll try to explain the position it holds in my kitchen as best I can. I actually didn’t buy it, it was a gift from my gorgeous husband. I didn’t even know it was Starck’s until I recognised the description in your OP, and I don’t know how much was paid for it the 10 or so years ago that it was given to me. I like it and when I think of juicing, maybe once every couple of months, or in winter it might stay out for a couple of weeks at a time, I think of it and how the shape and silver colour suits the whole enjoyable-feeling healthy-citrus fruit mess-breakfast- jarmies-morning music- experience. I was also given, at a fair where they were being demonstrated, a tiny clear plastic juicer that you plunge into the fruit, last year. The demonstration showed efficient juicing. This has never been used; if I still have it is at the back of a drawer somewhere. There is nothing fun about it.
Perhaps that is forming my needs around a failed product, but I think it is just enjoying myself. Actually, I don't think so because it suits me well. I’m not known for my practicality, and given the option would choose the path more aesthetically appealing, in fact, I do, often, if it doesn't take that much longer, and admire instances where others have too, like the resin floors in traditional Japanese buildings.
Why do humans need to be separated from technology, if you don’t need a machine making art for you, do you mean it can’t make art?
(BTW, I realize I have been imprecise, as ever, and, regarding my view of art, should have said ‘mass art can be art’ rather than ‘is’.)
... but I hardly consider that art! Its more like a flat empty shell of the real thing that is driven by consumerism. People are finding a way to brand everything these days, even art - I don't like it one bit! 
