It's hard work learning programming tools and optimizing, much easier to use a one-size-fits all framework that wastes the end-user's resources.
nsonha
It's NOT intelectually challenging. Software engineers love to learn new things, but they do not love 10 different syntaxes for displaying stuff. Figure it out.
chipsrafferty
What's the incentive to spend a lot of time to optimize for something you're giving away for free?