Again, as somebody that was grown catholic, where are you getting that from?

Then, like most catholics in the wild, you don’t have much grasp of the tenets of the religion. It’s weird that I’m the only one in my family who actually remembers anything from the catechism classes, but it seems standard in my see (that I’m not a part of anymore, but when I was forced to attend mass and such) that no one has any idea of the various positions of the faith espoused by the church. Catholicism is one of the interesting christian sects because it actually has a long history of ‘reasoning’ its way to the conclusions that shape the beliefs, and its sort of sad that the average person claiming catholicism as their religion knows so little of it.

Anyway, back to the original point: No meat on Fridays has been a thing for a very long time, in the actual annals of the religion’s leaders. Go look at the council of Trent and their declarations. For the philosophy of it, read Thomas Aquinas and his (now) laughable idea: The idea that fish don’t inherit original sin because they don’t have sex. For the practical reasons, go read the NPR article that details some of the history behind it.