The problem is that float parsing is highly non-trivial if you want it to be correct for all edge cases.

For integers, you're faster (in both development time and runtime) to write your own parser than to try and assemble the pieces in this pile of shit into a half-working one.

C++17 from_chars excluded. Incidentally, 2022 seems about right for the year that ONE open source implementation finally actually implemented the float part of that. Or was it more like 2024?