You are interested in economy and politics, yet you don't know how to file taxes. Is that not connected?
If you understand mechanics, yet can't do maintenance on your car, not even talking about fixing anything.
This level of theoretical knowledge that can't overreach to reality to do basic tasks seems just irrelevant to me. What is it good for apart of talking about it?
Based on your respective comments, I'd expect that the writer of the grandparent comment is the former type, while you are more the second type. Both are fine.
There is nothing wrong with being focused on just few issues.
But I have doubts when you claim some knowledge without being able to use it practically, which is what I see here.
If I'd say I'm jack of all trades, as I'm interrsted in software - but i hire a guy to make all the code for me because I don't know how - and that I'm very interested in knives - but my wife sharpens our knives as I don't know how - I have doubts about your actual knowledge if those fields.
I like watching youtube channels like Demolition ranch or Iraqveteran8888 for their technical expertise, viewpoints and just fun. Without any real expectation to ever own a gun to expand on this knowledge. Maybe some nice bow one day (which these channels don't even cover).
Don't expect everybody acting rationally all the time, considering cost/benefit against all activities, or similar.
But if your knowledge can't fulfill your need in same field, what is that knowledge for, or is that even actual knowledge?
Never said he couldn't change the oil on his car, just that he never bothered to. Didn't say he couldn't do his taxes, just that his wife takes care of it.