I mean, it's simply very strange to read this through the lens of some kind of "rules of hygiene" outlook. Nobody took it that way: jews weren't some kind of naive children, traditions and rituals were deeply embedded in their culture. The gospel account gives the actual context and explicitly shows it has nothing to do with hygiene. He never tells them not to wash their hands: I've had OCD so at least to me it's painfully obvious it's more like "don't do X hoping this will clean your soul", they explicitly talk of defiling which is a spiritual concept.

Christ was not against the concept of God's ceremonial rules/law: after all, He was the one instituting it in the beginning, my understanding is that He was against hypocrisy and burdening people with custom rabbinic rules instead of focusing on the spirit of the Law.

You can just take a look at the excess of some modern rabbinical judaism ceremonial rules for proof.

Again: it's very hard for me to understand how you can read those passages with such a strange mindset: material things were often just shortcuts to spiritual conversations, they already had thousands of years of Scripture in that direction