The GCC 15 transition has been very disruptive, but Fedora is known for being on the bleeding edge ("first" is in the "four foundations" [1]). Be glad because eventually everyone will get GCC 15, and we've worked out most of the problems for you already.
GCC 15.1 was released today. Your Fedora release was two weeks earlier, now using a nonexistent version of 15.0.1, ironically now including bugs you reported and that were fixed for 15.1. That just seems like poor decision making.
You're belittling the large amount of work done across thousands of packages to get them ready for GCC 15, which did involve backporting fixes to GCC 15 itself. All those fixes went into GCC upstream. GCC 15.1 was released two hours ago as of writing this message, even before the US wakes up, yet I'm sure there will be a build of it in Fedora later today.
Gentoo also has a tracker [1] for GCC 15 issues that they've been working on as well. (Note: GCC 15 is masked in Gentoo so you have to go out of your way to install it)
GCC 2.96 lasted a year or more and even after GCC 3.0 was released it wasn't able to compile a working kernel. This lasted two weeks and the issue is just a new warning; it's just bad timing across the release cycles of two projects.
[1] https://docs.fedoraproject.org/en-US/project/