What would quantum technology actually deliver?

Other than collapsing the internet when every pre-quantum algorithm is broken (nice jobs for the engineers who need to scramble to fix everything, I guess) and even more uncrackable comms for the military. Drug and chemistry discovery could improve a lot?

And to be quite honest, the prospect of a massive biotech revolution is downright scary rather than exciting to me because AI might be able to convince a teenager to shoot up a school now and then, but, say, generally-available protein synthesis capability means nutters could print their own prions.

Better healthcare technology in particular would be nice, but rather like food, the problem is that we already can provide it at a high standard to most people and choose not to.