Because you can now fully simulate arbitrary times during testing by providing your own implementation of the time provider. If you just take in a timezone as an argument, how will you simulate it being 2041-08-23T21:17:05.023743Z?
True. When you can just make any function be whatever you want whenever you want that sort of abstraction does seem a big much. I was responding to the specific question in reference to the time provider in .net 8.
