I recently bumped my company's fmtlib version to the one that has compile-time format strings, and it's been such a load off our minds to not have to worry about this anymore. We're reasonably early stage (12 people right now) and even with all of us being reasonably senior, I still found a few callsites where the compile-time format string caught bugs.

(FYI: for anyone holding off on this because of issues with spdlog, enough has been fixed in the latest versions of both that you can upgrade them together now.)

Also worth noting: the UX of fmtlib's compile-time format strings is actually quite interesting. There are error callbacks in the consteval calls that take advantage of the context that compilers show in compilation failures that detail the mistake being made.

(Aside: I'd also like to note that `absl::StrFormat` has supported compile-time format strings for quite a long time. https://abseil.io/docs/cpp/guides/format)