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orioninthenight The difficulty for the owner is that he or she might not want all these "features", many of which are meretricious, and merely add a lot of extra material, more to go wrong, higher sales price and more expensive and difficult to service.
We should be thinking of manufacturing goods to do what is necessary, rather than larding them with "because we can" extras wasting so much dwindling resources.
I don't advocate going back to 1960s crudeness and appallingly bad fuel consumption; but there comes a point where the "features" are not necessary and could even compromise safety!
I've a friend whose own car illustrates this. It is a hybrid, a Honda I think, and she is happy with it generally but it has one "feature" she finds annoying and potentially dangerous. If it "thinks" you are too close to objects on the nearside it does not warn you. Instead it grabs control of the steering - ignoring that you may have pulled in very closely for a very good reason, such as passing an approaching vehicle in a very narrow road. She does not want this, and tells me though you can switch it off at the start of the journey you have to do that for
every journey - you can't turn it off and leave it off.
While looking at some car reviews, the amount of additional "stuff" and needless complexity especially in the more expensive models in some makes is staggering. Who the Hell needs 24 loudspeakers inside a car? Or a 700 Watt radio? Or has to use a "smart"-phone to adjust the seat?
I don't think it's a matter of needing separate assembly-lines but every manufacturer makes models differing in details like the additional "features" already, so it can't be that hard to design and build a variant that does just what is needed by buyers who don't want to waste their money on 22 surplus loudspeakers, or the potentially hazardous, so-called "infotainment" screens" in the middle of the dashboard - an idea as bad as the term. If designed properly the gee-gaws can be added later, or at least connected, by owners who want them.