I'm saddened and disagree with Apple's exit out of the market. The router is still an essential piece for the Internet age. And the AirPort Extreme made built-in incremental backups available for consumers. Without it, one has to either pay for "local backups" via apps like Super Duper or go online like Backblaze (which I endorse). Either way you'll have to fork out a bit more cash and a bit more manual labor for the consumer (who are not all sophisticated tech-wise).
That device should have been a router/home backup system/mesh enabled/smart device/TV-type/home speaker all in one.
Until the day comes when I need a mesh network, I'll try to preserve my AirPort as long as I can, as that's how my family's computers are backed up (while the data OCD me have a couple of copies also backed up via other means).