I felt like I should respond to this, too.

It's not, but it is not unreasonable to object to implementing new ways for browsers to hog resources pretty much at the hosts' discretion. In this case it can be argued that it's poor use of technology to implement it in the browser.

On a similar basis, one might argue that it's poor use of technology to kill people with dynamite, but it is also reasonable to take a step back and argue that it is poor use of technology already at the point at which you gave a toddler the detonator. Regardless, dynamite is an excellent and useful technology.