I think “booting” might become a concept that goes the way of “download.” That is, it will eventually be unknowable to those who didn’t grow up with it. Computers are just on, and files are just accessed.
I (somewhat) rarely do a full reboot either, and Linux on my laptop may go for a couple of months without a reboot, but I don't really trust that updates to the desktop environment or even lower-level libraries or things like systemd would be in effect without restarting most or all of the system. (Not to mention the kernel, of course, but kernel vulnerabilities that are easily exploitable remotely would probably create a ruckus.)
I guess you could also just trust that there aren't remotely exploitable vulnerabilities in those components, but I honestly don't have the energy to keep track.
By that point rebooting occasionally just becomes simpler.