As someone who has primarily met my partners through online dating/meeting through apps, I don't agree with this. The dating pool in my immediate irl distance is not what I'd call great, nor do I want to subject myself to going to a bar or club to meet someone. I've never had success of any kind there, it honestly just made me want to never step foot into those places again wjth the amount of sexual harassment I've encountered.
Meanwhile I've had some really amazing dates and times with those I've met online or through apps. I also haven't been cheated on since high school with any person I've met online, when all of the relationships I've had in person have led to it. Ultimately, it depends on the person in question and their specific situation but I wouldn't just flat out discourage people from using a different way to find happiness.
Side note, pretty sure the point of finding someone in 14 is to find someone who does share your hobby. Why would you be searching if you already had someone irl interested? Most of the people I've spoken to in terms of having their significant other play with them have said they either aren't interested in gaming or are interested in extremely casual stuff like Animal Crossing. They wish that they had an interest but they just don't and they can't force them to play the game. So, they take on an in game wife that their irl person is perfectly fine with because they know their relationship is solid and their significant other is happy.
As far as it being a rarity, of course it is if you're looking for "the one". The same can also be said about finding someone irl too. You gotta dig through the dirt to find gold, doesn't matter if it's irl or online. Real love takes time to find and honestly won't show up until you DON'T look for it.