If you are racing then there is arm and upper body effort applied to the bars,
as well as the strong trunk muscles from weight training to stay on the game.

slacker seat tube part typically of a bike made to sit upright,
perhaps part of looking good, on the streets of CPH ..

race bikes have custom parameters if you need them ..
seat angle related to thigh/femur length, in relation to the crank.

Headtube /fork rake is determining the handling .
Town block circling Criteriums, or stage racing 5 + hours, between cities ,
has different needs.