If Moshe Rabbeinu were to come back today and need to borrow a pair of tefillin, I would be comfortable giving him mine because I know that they are exactly the same as every other pair going back to Har Sinai; our rules are what gives Judaism power. We are who we were.
I don’t know what the world will look like in a hundred years, but I am certain that Jewish women will still be lighting Shabbos candles. Our rules aren’t a means to an end, but the end itself. ~ R’ David Lau