I'm going to reveal a big secret. I actually managed to find out the tidbit about IE 7 without reading it line by line.
Their primary job is not marketing. Their primary job is to build the framework.
Why do you think things like Y Combinator exists? They do some work others aren't willing to and others lose out because of it.
It's to the developer's benefit to tell you why his product is good, but it's not their duty. These guys worked on and released a free product for you. You can choose to use it if you want but they don't owe you anything or an explanation of why it's better than Bootstrap.
The immediate question that popped up when I first see their project's homepage is "How is it different from Bootstrap? Why should I use it?" I looked around and they don't offer an explanation, so I left and continue to use what I'm using.
The developers put reasonable efforts in building the website, introducing the project so that people will adopt it, so I think an article comparing their project with Bootstrap definitely helps with adoption.
Nowhere did I imply they had a duty to do so - just that it'd be to their benefit, because the people considering such a framework have dozens to choose from that all look alike. They presumably put it out there because they'd like people to use it.
Their primary job is not marketing. Their primary job is to build the framework.
Why do you think things like Y Combinator exists? They do some work others aren't willing to and others lose out because of it.
It's to the developer's benefit to tell you why his product is good, but it's not their duty. These guys worked on and released a free product for you. You can choose to use it if you want but they don't owe you anything or an explanation of why it's better than Bootstrap.