Providing that type of functionality will set
the integrators apart but I'd wager that unless
that was sold and shown as a benefit many
customers would live with it the way they
have with multidisc changers and be fine
(not blown away).
But isn't the point that those folks who want to sell a system want to provide more benefits to the customer so that they get more sales relative to someone who provides less? There are two perspectives here. One is a CI who is selling a system that doesnt' support X and therefore just pretends X doesn't exist and hopes the customer doesn't know better. The other is the marketplace of products in this space and what they can do and CIs selling the ones that do X will make other product look sub-optimal by pointing this out.
[EDIT: Oops, this is kind of redundant relative to the previous post since I didn't read to the end before posting...]