The teshuvos that change are ones like Reb Moshe’s teshuva on pidyon haben where in Russia gold was the new silver, so pidyon haben had to be based off gold not silver. But a halachic principle like the requirement for kabbolas ol mitzvos does not change. Does lo sirtzach change as well? Actually, according to some here it does. but not according to most poskim. Ironclad rules do not change, no matter how much the secular Zionists want them to.
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