The argument certainly does hold water
because people are lazy or have no interest in learning a real instrument. And of course there are those who aren't that coordinated, or totally lack rhythm when they don't have a scrolling note chart or have all the creativity of a ballpoint pen. The list of reasons people might not want to learn an instrument could be numerous. On the other hand, you can be a video game player who puts in less time than it takes to beat an average RPG and be playing at least some, if not most, of these songs on Expert. That's a much lower time investment than learning any instrument with the level of proficiency required to play even 1/4 of the songs in the games (well, except maybe the Bass parts
). Not only that, but you can work your way up the difficulties which means you get a sense of instant gratification. Gratification in learning an instrument is generally delayed by a good margin.