Check out Rabbi Grossman’s recent essay on this.
Some examples he gives:
“We pronounce the last letter of the alphabet just like a samech, and that is meant to be so because it is intentional, and we will not consider any evidence or arguments to the contrary,” “our matza is in the form of crackers, and therefore must be in the form of crackers to the exclusion of all other forms,” or, “the Rosh and Taz did not eat locusts because they did not know which were kosher, and therefore we can never know.”