Why are there mishnayot which discuss halachot of situations that occured in history and can never occur again?
As an example of this phenomenon, consider Nega'im 7:1:
אֵלּוּ בֶהָרוֹת טְהוֹרוֹת. שֶׁהָיוּ בוֹ קֹדֶם לְמַתַּן תּוֹרָה...
The following bright spots are clean: Those that one had before the Torah was given...
A further example that comes to mind is Zevachim 14:4-7.
Is this simply a case of magnifying and glorifying the Torah, or is there something more going on?