I’m not on here much, but...

If only there was a shrimp reference...

No answer will satisfy though, so there's plenty of room...)

There's a lot of things people do everyday that isn't included in the Bible as instructions.

Case in point, boiled water was probably happening for as long as there had been fire.

Further, much fresh water doesn't even require boiling. The Bible was not a Good Housekeeping magazine.

Interpretation

Early writers, like Maimonides, state that the prohibition was a case of the general law (Leviticus 20:23) against imitating Canaanite customs. Maimonides wrote: "the heathen priests adorned themselves with garments containing vegetable and animal materials, while they held in their hand a seal of mineral. This you will find written in their books".[1] Classical Kabbalah regarded such combinations as a defiance of God, because according to them, God had given each species individuality.[citation needed]

Because the priest's girdle, and the tzitzit which every man wore, are preferably made from shatnez,[citation needed] the prohibition was a way of setting aside this fiber blend only for holy purposes.

According to modern biblical scholars (and Josephus), the rules against these mixtures are survivals of the clothing of the ancient Jewish temple and that these mixtures were considered to be holy and/or were forfeited to a sanctuary.[2][3] It may also be observed that linen is a product of a riverine agricultural economy, such as that of the Nile Valley, while wool is a product of a desert, pastoral economy, such as that of the Hebrew tribes. Mixing the two together symbolically mixes Egypt and the Hebrews. It also violates a more general aversion to the mixing of categories found in the Leviticus holiness code, as suggested by anthropologists such as Mary Douglas.[citation needed]