...there's nothing really that much 'cutting edge' about it. I believe all systems after 2012 have UEFI support.
Most (but not all for sure) systems after 2009 actually have. Those people in between might be affected, yes.
As for running Fedora on a pre-2008 system...well, that would be imho at the very least...weird.
Even with the conservative Debian / Ubuntu & derivatives, and you frequently see that stuff,
doesn't really work properly 'out of the box' anymore.
If it runs like an aging paraplegic dog on userland level...what's the point in the first place, UEFI or not UEFI.
But...most Fedora users are developers / programmers (and furthermore, most - but not all - kernel devs use Fedora).
Kinda doubt they rebuild the kernel on such old systems...
they naturally use at least relatively new hardware (and even then, i'm probably underplaying it).
That's what Fedora's end user base is for the most part, not people who want to revive in...2021,
their Fujitsu Siemens from 2004 that they had stashed in the attic.
Fedora is famous after all for carrying patches (kernel, xorg) possibly not-even-yet-upstream for newer hardware,
not for maintaining custom workarounds for computers from the previous decade (that would be eg. Antix i'd believe)...
RHEL9 was also looking at dropping support for older processors
Furthermore, although their proposals do indeed start somewhat on the 'radical' side,
in due course of their semi-internal discussions, they always seem to find a reasonable in-between balance.
Based on what their target end-user base is
, it makes perfect sense to want to cut-off the slack here or there.
In any case, a moot point, as already stated above,
by the end of the year / early next year, Intel will support only UEFI, so...
It's already a bit weird in 2021 running 64-bit OS (eg. with Ubuntu having dropped 32-bit in 2018), but...
continuing to boot via Legacy / CSM 16-bit BIOS (and i believe even such is emulated?)...
So yeah, in 5-6 yrs from now...i'd find it kinda weird in say 2026 for eg. Canonical,
to actively 'bother' supporting installation in say...Sandybridge systems or earlier.
Simply because none of their paid clients will be using such as well - only diy hobbyists at home.
Not to mention that stuff like SecureBoot become more & more popular in the actual corporate world...
..."No worries, people". Never really had any worries myself about UEFI in the first place... why would I?