Fagin, does the argument about being able to replace, or make new parts hold up for bicycles? For example - My 1988 Trekker needs new sprockets: the cassette is fixed on the free hub body by the 13T top sprocket screwing on, rather than the current system of a lock ring. Maybe the splines are the same, haven't got round to checking yet and maybe I can sort something out with a new cassette and use the (virtually unused!!) 13T sprocket to lock it. I think the 1" threaded headset may be a bit notchy too and I wonder if I'll be able to get a new one. If the hub cones are worn, will I be able to replace them? Maybe I'm being pessimistic, I'm a bit new to the joys of rebuilding Shimano. Certainly when I rebuilt a 1965 Moulton back in the mid 1980's I was able to get some of the unique suspension parts from Michael Woolf at Moulton Preservation (and could get even more parts from him now), but that's a bit of a special case.
Of course, with the right equipment and skills anything on a bike can be made or mended, but I haven't got the skills! This sort of forum is of huge value in getting advice about what can be done and what can't.
I wouldn't knock Shimano for a second, but I do rather feel that the downside of their constant development and real improvement is a larger degree of built in obsolescence. When I was a lad Campag was Campag and it didn't change much for decades. (Maybe rose tinted retrospectacles.)
Maybe a cottage industry will grow to produce some of these quaint old bits like hub cones. It certainly exists in the old motorbike world.