As long as the 64-bit OS can still run 32-bit programs for now that's fine as there is still a stupid amount of modern 32-bit programs out there, which is insane considering the Athlon 64 came out 18yrs ago. 32-bit programs should be dead by now.
As for the 32-bit version of Windows, that should have been scrapped many years ago, even as far back as Windows 7. The only reason to run a 32-bit OS is to run 16-bit programs and if you need to run programs as old as that you have no reason to run a modern OS.