the support got much better since exFAT became part of the SDXC specifications (anything that supports SD cards bigger than 32GB has to support exFAT). At minimum it has read/write support built into Windows, Linux, macOS, Android and iOS, so an exFAT formatted external drive is supported by 99% devices I need to plug one into.
The only device I can think of that doesn't support exFAT drives and I used it at least once with an external drive is my Asus router (and it runs kernel 5.4 so it could support it, but I guess it was omitted to keep the kernel small).
The only device I can think of that doesn't support exFAT drives and I used it at least once with an external drive is my Asus router (and it runs kernel 5.4 so it could support it, but I guess it was omitted to keep the kernel small).