As of release 37, Fedora has deprecated legacy BIOS installs [0] -
you can still boot and presumably upgrade an existing OS install
over the network, but you can no longer install it fresh.

I think the biggest issue with this decision for me is the lack of
awareness around e-waste and re-purposing of old hardware that may
have many years of useful life left.  I know I am not alone in that
I mostly buy refurbished or older computers. I keep them for years
and maintain them or replace parts in them as needed, and only junk
them when they are truly dead. Fedora even offers an LXDE spin which
is touted as useful for older hardware:

    "LXDE is not designed to be powerful and bloated, but to be
    usable and slim. A main goal of LXDE is to keep computer
    resource usage low. It is especially designed for computers with
    low hardware specifications like netbooks, mobile devices
    (e.g. MIDs) or older computers." [1]

I guess not _too_ old, then. Luckily, there are plenty of other OS
choices that do support legacy BIOS installs.

[0]: https://fedoraproject.org/wiki/Changes/DeprecateLegacyBIOS
[1]: https://spins.fedoraproject.org/en/lxde/