Why does switching typefaces completely change the personality of a design even when nothing else moves?

I have been obsessing over this lately. I took the same layout, same spacing, same color palette, same everything, and just swapped the typeface. The shift in feeling was immediate and honestly kind of unsettling in a good way. A condensed grotesque made the piece feel urgent and almost aggressive. A geometric sans made it feel clinical and modern. A transitional serif made it feel trustworthy and a little old money. Nothing else changed. Same hierarchy, same grid, same proportions. It made me realize how m