You have avoided any reference to the likely reason many people do not solicit feedback. I’m guessing this is intentional, but its absence leaves an otherwise good article incomplete.
Many people do not want to invite criticism, even if they handle it well.
Most individual feedback that is unsolicited or published openly (e.g., LinkedIn) is positive. Most people, if they have nothing positive to say, will indeed say nothing in such an environment.
Asking for direct feedback is more likely to invite honesty, which might not be as positive. This is extremely useful, of course, assuming it has some validity.
There are two reasons for this evasion.
First, most people don’t like to be criticized. It can be uncomfortable. Egos get bruised. People get angry and defensive.
Second, when such feedback does include opportunities for improvement (my word choice), the recipient can and should feel an obligation to address them. That’s the point. It’s also a potential stressor.
None of this is revelatory. Some people get uncomfortable or defensive when receiving feedback. Not mentioning it, however, does leave a gap in your message.
Note that I’m not ruling out the possibility that this gap was left intentionally, possibly to solicit feedback from your readers.