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I don't have experience with Vitsoe but presumably they can trim the shelf at the edges to match your alcove? Or does it sort of float in space?
You have a lot of opinions for someone so badly informed about the subject.
They are fixed size 'bays' 66 and 90cm roughly. The steel is folded in such a way that it enhances the strength of the shelves and reduces the weight. The aluminium track allows you to 'join' bays together and can support all the weight of hundreds of records on 2 stainless steel pins.
I could go on but it's a recognised design classic from a recognised designer it appears in many design collections/museums. There have been films made about the system and the designer and it's sold well and holds it value over time. So your comments about it's qualities which turn out to be spectacularly badly informed are barely worth the time it takes to read them!
You can trim the track away if you don't want it. It's very handy for making sure everything is bang on straight and uniform though. It makes installing it a doddle. It braces the weight of the heavier items across the full length of the track. And so it really forms part of the aesthetic [function -> form, not the other way round). So you don't see many folks doing this (or buying the micro short lengths of track) to do what you suggest.
Wouldn't that mean the shelf width would have to match the width of the alcove (so everyone would need custom width shelving?)
As above, if you don't like seeing the track, just cut the excess / unused track away, assuming the substrate is strong enough to support the weight. Probably wouldn't do it on drywall, but if going to into brick it's possible.