For those panicking about it, this is not something you need to worry about. Here’s what this actually does:
Enforce the use of GPT partition tables for all UEFI-based Fedora installations for x86 architecture. This removes support for installing Fedora in UEFI mode on MBR-partitioned disks on x86 systems
You probably have already been using GPT on your UEFI system since you had a UEFI system. Even if you somehow were using MBR, this probably;
Won’t break existing installations, as it’s merely support for installs of this type
Would not be a problem even if somehow the broke existing installs, as it’s not difficult to convert MBR to GPT.
For those panicking about it, this is not something you need to worry about. Here’s what this actually does:
You probably have already been using GPT on your UEFI system since you had a UEFI system. Even if you somehow were using MBR, this probably;