Guess who's second on the feature request poll on that max console site here? http://www.thatsiteyouknow.com/votings/categories/gateway-3ds-feature-request.2/?order=most_votedi wouldnt think streaming or a screenshot feature has a massive demand to make it a requirement.
Video Capture. Right after GBA support (which I have no idea why it's so high since, if you dualboot Gateway and Luma for example, you can have it, or you could use retroarch too for N3DS users...).
Even funnier, screen streaming in general appears twice in the top 15 most wanted features.
Note, I obviously nuked the url because I'm not sure if it's allowed here, but you should be able to get there.