One thing about rendering to a bitmap is that it is more robust over time. Look how much code is in the browser to support older styles of html. Smart endpoints

One thing about rendering to a bitmap is that it is more robust over time. Look how much code is in the browser to support older styles of html. Smart endpoints dumb pipes, prevents ossification. The browser tries to be far too smart for its own good and ends up making a mediocre job of everything while being hugely complex (as outlined by parent above)