A lack of desire to implement technologies that are harmful to the Web; specifically technologies designed to usurp control from the user and/or its agent.
Remove Javascript and 90% of your challenges go away.
Remove HTML/CSS rendering and the other 10% of the challenges go away too. Skip the whole “browser" thing and just use `curl`. Zero harmful technologies, maximum user control - I’m sure all of the users will be flocking to this new approach in no time :D
Remove Javascript and 90% of your challenges go away.