"Create opinionated material and share the shit out of it." ... this is downright terrible advice, for either introverts or extroverts.
And introverts are generally capable of going through life without being noticed as much as extroverts, and don't feel the need to create divisive clickbait to share like an asshole. That's why we're introverts. It's okay!
Familiarity with frameworks is useful, but knowing plain JavaScript inside out is way more valuable than being able to recite various APIs. But if your friend hasn't found the job yet, and therefore doesn't know what framework he will spend his days learning to loathe, I'd say put together a few small projects with a smattering of libraries to get a better sense of their strengths and weaknesses, what problems get solved, etc.
No. There is no correct question. There are a ton of factors involved in an individual's performance, some of which are personal, some are organizational, some are circumstantial.
Don't oversimplify it. Asking why does not allow you to find out how to make everyone succeed. It might help. It might not. But in general, I don't put much stock in notions of everybody succeeding. That's rhetoric, not real world.
Being an A or B player isn't something that happens at birth. Your performance at work depends on a lot of factors.
But there are B players out there, and A players are doing better work than them. This is irrefutable if you've ever worked on a team of significant size. It's not supposed to be some personality-damning attribute that implies a B player is forever doomed, or always brings less utility to the table than an A player. It is specific to their current role, work, etc.
What a perplexing combination of emotions. Sorry you got laid off, but it sounds like you're upset at losing your job and therefore have concluded that your job is not what you thought it was.
Much like the author, I am left asking "why?" with no good explanation being given.
Yes, I am in my mid/late 20s and am mostly focused on my career. I am not interesting in the way she wants her mate to be interesting, nor do I care. She will find somebody different, as will I.
Nothing lost, nothing gained. Have fun on this planet, don't get too worked up about dating.
And introverts are generally capable of going through life without being noticed as much as extroverts, and don't feel the need to create divisive clickbait to share like an asshole. That's why we're introverts. It's okay!