Why should we be forced NOT to use a technology that provides superior response and productivity than what was traditionally possible?
On many websites heavy (ab)use of JavaScript/AJAX has the opposite effect. It makes them less responsive and lowers productivity compared to what it could be if those sites were mostly static. Instead of waiting for one HTTP request to complete, we're waiting for fifty or a hundred and fifty. Instead of waiting for optimized browser code to render HTML, we're waiting for a tangled mess of inefficient and hastily written scripts to do its magic.
On many websites heavy (ab)use of JavaScript/AJAX has the opposite effect. It makes them less responsive and lowers productivity compared to what it could be if those sites were mostly static. Instead of waiting for one HTTP request to complete, we're waiting for fifty or a hundred and fifty. Instead of waiting for optimized browser code to render HTML, we're waiting for a tangled mess of inefficient and hastily written scripts to do its magic.