toadyody
It usually works out pretty well with native speakers not familiar with the term. They usually have a moment with a blank stare thinking “what the hell is an acoustic bike?” and then realize all at once with a smirk.
As for your second question, acoustic becomes a good classification when talking to a group where electric bikes are the default, just like electric becomes a good classification where pure pedal bikes are the default. In a group where ebikes are the default they might assume you’re talking about throttle type if you say analog, or a pedal assist bike if you said manual. It started as a joke and became a useful term.
This is such a strange take. Just because people think that the current system doesn’t work doesn’t mean they automatically jump to wanting despotism even if enlightened. People who throw up their hands at political gridlock and see it as a justification for dictatorship, and not as reasons to iterate and improve upon the existing system are weirdos.