Limiting yourself to the likely candidates requires a level of awareness around polling - that information is practically forced down our throats since voting in America pretty much requires it, but polling information (what other people think of the candidate) isn't an important piece of information for the voter - it's their opinion the system ideally wants them to express.

RCV is, at a maximum, equally as complicated as FPTP style voting since you have the option to elect only a single choice on your ballot (unless they're doing something weird). The form of the ballot may be visually more overwhelming but that's just from unfamiliarity.