Yes! Because they're awesome.

Nobody needs to hang-glide, or play video games, or run electricity through guitars.

Any sufficiently-advanced civilization will have jet packs, supersonic underwater trains (in tunnels, I'd guess, for the sake of the whales), and sex bots, and many other nice things.

Now I'm imagining the cheese shops...

Yes! Because they're awesome.

Nobody needs to hang-glide, or play video games, or run electricity through guitars.

Any sufficiently-advanced civilization will have jet packs, supersonic underwater trains (in tunnels, I'd guess, for the sake of the whales), and sex bots, and many other nice things.

This does not establish why they are necessary, only why they will exist. But once they exist, they will become an integral part of someone's business model. You don't think of semi trucks being indispensable, and they're probably not, but it would be an economic disaster if they all disappeared tomorrow.