I strongly believe that if you set aside genre preferences the solid body electric guitar coupled to a tube amplifier is objectively the greatest electronic instrument ever created. All other electronic instruments, with the one exception being the Theramin, have a fundamental problem with human expression. There is an unsolvable disconnect between what the performer's actions and their audience. See: https://www.scr…
Electric bass? Heck, even in synthesizers, you have the EWI or the Haken Continuum.
Guitar (and bass) are obviously and far and away the most successful, but it does a disservice to a number of wonderful inventions to say they're the only ones. Just look at what the Japanese band T-SQUARE does with the EWI to see people innovating at the edges.