For me it is the concept of registering to vote. I am citizen so I have the right to vote automatically and only thing I need to provide is some accepted ID.
Having only 2 realistic choices
No, not really. Only some parts of the english-speaking world use FPTP and it’s not that common to have only 2 choices unless you have that system.
FPTP is not the only form of being limited to two (or fewer) choices. Look at Georgia, Cambodia and Thailand as a few examples. Vietnam, Russia and China for other limited-choice countries. Not sure what the “english-speaking” part is relevant for.
No, in systems where there is a dictator, corruption and no realistic opportunity for other parties to get a foothold.