can't speak about the very recent updates, but windows have been consistent and adamant on keeping the backward compatibility. they still use reserved file names for io devices so that 30+ year old printers can still work, and you can still open a 2000s doc file in office 365. (I'm looking at you Apple, who made many of the 32 bit apps I loved useless)
relevant video: https://youtu.be/bC6tngl0PTI (Tom Scott: Why you can't use CON as filename in windows)