You can't compare that to gene-editing treatments, that's two completely different level.
Self driving car were always almost feasible, 20 years ago top gear made cars you could drive with controller like kids do with toy cars. We already had camera and computer, it was just a matter of raw CPU performance and software development..
we have all the CPU performance we need and all software development we need and self-driving cars are driving around in roughly 0.00785% of world’s cities :)
Just because you can hit some germ-line cells in the liver, for example, doesn’t imply you’ll have good penetration into the reproductive organs.
We can’t zap people and change all their DNA at once, unless we can intervene at the point it’s just a few cells.