Often enough to matter, given that the preferred update method for OS updates in Fedora increasingly relies on offline updates so that correctness can be enforced.

Especially as Fedora moves towards Silverblue (aka Atomic/OSTree) which uses a content-store, hard-link farm, and pivot-root at boot for atomic upgrades.

Systems using A/B partition flipping (such as ChromeOS) would also benefit from this.

Absolutely everyone boots from cold, a non-zero number of times. If it looks bad, then everyone will see that... and it will be the first thing they see, every single time they do that.

Fedora and GNOME encourage people to turn off and reboot the computer to install updates.

It's like having a nice house with a shitty front door. It's definitely worth getting right.