Long-time Rebbi, Yeshiva Torah V’Daas.
From his Ohr Chaim/”Scheiners” piece in 2020 (p.15):
“This was also the case for any new insight in avodas Hashem. If he would hear of a better way to do a mitzvah, he would try to implement it into his own avodas Hashem. Towards the end of his life, he learned the sugya in Menachos, and felt it was correct to wear techeiles, and started to do so. It didn’t matter if for 80 years he had done otherwise. “
