David Yates wrote a great defense of RSS which I completely agree with. To summarize the salient points:

Most IndieWeb folks are also really gung-ho about mf2 and h-feed, and while I don’t see any reason not to support it (and it certainly does have some advantages in terms of it being easier to integrate into a system that isn’t feed-aware or convenient to set up multiple templates), I’ve run into plenty of pitfalls when it comes to actually adding mf2 markup to my own site (for example, having to deal with ambiguities with nesting stuff and dealing with below-the-fold content, not to mention a lot of confusion over things like p-summary vs. e-content), and so far there doesn’t seem to be any real advantage to doing so since everything that supports h-feed also supports RSS/Atom, as far as I’m aware.