They didn't have printing press or some conscious aesthetic architecture-typecafe correspondence. That's just how the letters evolve if you want to quickly and densely copy them with a quill. It's like trying to draw meanings from connections between cuneiform and ziggurats.
https://en.wikipedia.org/wiki/Blackletter
"Why do all of this? Because otherwise, the base of the building would look like it was sagging, and the columns would look like they were about to fall outwards."
Or, you know, it would ACTUALLY sag. The columns would ACTUALLY fall outwards.