I do a similar thing for Chrome. It's not so much the missing minor feature, as much as the way the dev/mgmt team works. If Safari refuses to have favicons, then they might think another important thing for you is not important for them. For me, I refuse to use Chrome because they don't want to put an option or allow extensions to remove the X button on the tabs. It's silly, I know. But I want it because I press it accidentally every now and then. I might be missing out on other features etc they have, but I want this small think that they don't want to have. It's about the principal. For me, and for many others, each with their own requirements.