Having only read the abstract and key points: The question is if video games have a better positive impact on cognitive abilities than other things you could do in the meantime that may also improve other abilities as well. I write this because I quit video games almost entirely a year ago. I played probably 500-700 hours of video games in 2015. I played occasionally simple games on my phone in 2016. The major downsi…
Maybe you are paying the wrong kind of games? I think online competitive games, like esports, only make you better at playing games, but other single player games are comparable artforms and only nominally "pointless wastes if time".
People have a tendency to apply a Puritan-esque attitude to games, assuming that less 'productive' (read: violent) games must also be less useful, and games that are more artsy, or revolve or around building (Minecraft), or are more abstract/less gamey (brain training games) must be more useful.
The reality is that people improve their cognitive abilities more when under more stress, when they're challenging themselves, not because the activity is more of an 'art form'. Repeatedly going to the opera may have other benefits, but it isn't going to make your brain compute any faster.