My blog does this. Not because I want to hide it. Since RSS is a standard, I expect anyone wanting to add my blog to their RSS would just use the current URL and the reader will grab the alt meta tag. I have multiple feeds, one for each tag, so if a reader uses a blog post URL they'll be given a choice on what tag to subscribe to (or everything). Having separate RSS links on the page for this would add clutter.
Before, Firefox used to show the RSS icon but they killed it. It really should be a browser-level thing, it's no different from favicons, rather than requiring users to hunt down a link somewhere on the page.
