ok, so I think we all agree that “halakha changed”.
Avira puts a couple of useful caveats to that:
– easier to add chumros, gedorim than other way around based on “greater beis din”
– applications change, but principles stay the same
I mostly agree with these, just pointing out that the serious answer is longer than “halakha did not change”. I actually once – many years ago – tried to be friendly with a C- Rabbi. His first question was “do you agree that halakha change”. I answered “yes”. He then deduced “so, you agree with us?”. Surprised, I answered “no”. He somehow got upset and ended the conversation. Maybe, his expectations were too high after the “yes”.