Medieval people were a lot shorter too. When I was in Saint Basil Cathedral in Moscow I was amazed how narrow and low were the corridors inside those side towers. I hit my head multiple in that church.

Btw- the average male and female height adjusted for location keeps increasing which points to protein deficit: https://ourworldindata.org/human-height

(In the world graph towards the end the height seems to decrease since 1990s-this is because countries with shorter people have a higher birth rate. Within the same population the height is still increasing)

At 6' I'm unlikely to ever dunk on my 6'4" brother, which is a bummer, but ego aside I'm not really impacted much by my height since I can secure food and shelter by pressing buttons and pushing a mouse. From an evolutionary perspective I understand the preference to be bigger, but I wonder if it's still a logical aspiration for modern humans. More cells means a higher risk of cancer, after all.