why should i care that the content i create is accessible to all? Lots of reasons, depending on what you are doing. You don't have to though, and if you don't

why should i care that the content i create is accessible to all? Lots of reasons, depending on what you are doing. You don't have to though, and if you don't care then the advice on that site isn't for you. But that doesn't mean it isn't useful advice. If I was setting up something like a global payment network, or any other service where accessing people with minimal browsers would be useful, then I would care about it a lot.