Rusttree, you seem to be missing the point. That IC can be used as both a boost converter or a SEPIC converter, depending on what is required for the given application a boost converter design is going to be simpler than a sepic design, so being able to do both is a selling point. SEPIC converters aren't inherently better than a boost converter, or a buck converter in every given application. Many applications are even fine with traditional buck-boost converters that aren't full sepic designs because the features of a sepic (non-inverted output and a true shutdown mode) may not be required.
There is no such thing in electronics as an inherently superior device, it's ALWAYS dependent on the application. In your case, using it as a SEPIC converter is probably justified, though again it is rated for 14 times the current you want.