that's life 95% of the time. many people have an opinion, but most of them don't have the depth needed. the important thing is that you 1) are curious 2) you keep learning.
In regards to this, what approaches can people take to become more T-shaped? I consider Hacker News a very good resource for learning, however, I sometimes feel overwhelmed by the amount of information I miss out on.
Something that I like to do is try to come up with every topic that I can possibly think of. I just thought about what I might interact with on an average day and came up with clothing design, restaurants management, window installation, gasoline manufacture, and book binding. And then I try to find out the bare basics about each topic, no matter how weird or esoteric.
This sounds like a great topic for an "Ask HN" post.