What's more important, telling someone about your problem or hearing their support?
Socializing is weird- media and networks only change the ways in which it's weird. I think that the main point stands- this is a healthier social landscape than it was 20 years ago. As someone who grew up at the same time as social media, I think that's been the trajectory of my life as well.
On the other hand, I would agree with you that I wouldn't say that any of these positive social ramifications are making them better writers. I think that's stretching the term a bit. Sure, it's great if you're comfortable writing about what's dear to you. But you should also know a language and some composition.