One important difference is that video games are optimized to be fun while musical instruments aren't. Therefore, playing an instrument can signal discipline in a way that playing a game can't.
I'm not sure that's true. There's selection pressure on musical instruments to make them fun to use. Most of the corresponding training also mostly isn't optimised for learning but for fun.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.