: Possible advantages of having visible feed links: For visitors that know what feeds are: If they (currently) don’t use a user agent with feed autodiscovery¹, they still get informed that

Possible advantages of having visible feed links:

For visitors that know what feeds are:

If they (currently) don’t use a user agent with feed autodiscovery¹, they still get informed that you offer feeds and which URLs they have.
If they use a user agent with feed autodiscovery, they might not expect to find a feed on your site (and therefore don’t pay attention to the autodiscovery icon), or might not intend to subscribe to your feed. Stumbling upon the visible feed link could remind them or "convince" them to subscribe ("Ah, a feed … why not").
Search engine users might try to find your feed by searching for "… feed". Having a link that contains this keyword helps here.

For visitors that don’t know what feeds are:

They get the chance to learn about it.²

If you offer multiple feeds:

Some user agents with feed autodiscovery only discover / allow accessing the first³ feed, so these users still have the chance to find your other feeds thanks to the visible links.
It can be too complex to describe their meaning/differences in the title attributes. A separate page that links and describes all your feeds offers more clarity.

Possible disadvantages of having visible feed links:

They need some space.
The site design might not be suitable for adding them.

Only you (with your site and users in mind) can decide what’s more important.

¹ Feed autodiscovery works by using link (or a/area) elements with the alternate link type and the feed format in the type attribute (i.e., application/rss+xml or application/atom+xml).

² You’re one of today’s lucky 10000. ;-)

³ The HTML5 spec defines that the first one is the default feed:

The first […] must be treated as the default syndication feed for the purposes of feed autodiscovery.

N.B. This very question ("[icon] question feed") as well as the linked XKCD comic ("RSS Feed - Atom Feed") contain visible feed links.