CSS and browser engines are increasingly complicated. Why not serve PDF and be done with it? Why reimplement complex typesetting, multiple times in different br

CSS and browser engines are increasingly complicated. Why not serve PDF and be done with it? Why reimplement complex typesetting, multiple times in different browsers, and why does it have to all happen on the client-side if you want pixel-perfect display anyway? This seem like an example of stretching a decision made decades ago far beyond the point it makes sense.