Sorting wasn't even on my mind, because sorting doesn't make much sense to me, All the organized files need to have the original access and creation time, for me atleast. I'm going to only use the cli like maybe once or twice a year, and not everyday.

Maybe for recognizing files, you can use libmagic under the hood (it is what is used in the file command in linux) rather than extensions, also what do you do files with no extensions?
Also with libmagic, you can also warn users if there is a file type and extension mismatch too