Some people are born to specialize. I’m one of them. If the planets in your chart are bunched up, this would be strong indication you’re designed this way.
Am I really interested in anything other than sex and psych, relationships and religion & philosophy? I’m not! So why would I learn to read a horary chart? Surely someone is going to be (naturally) better at that than I am. Why not leave this work to them?
But if you’re stressed out of your mind, wracked with pain, you should probably come see me because I can speak that language. Not only will I not blink. I’m likely to have you patched up and back on the road within an hour. You may even laugh through your surgery! Specializing makes sense for many.
Degas could paint and sculpt but most of us do have something we are good and we fare well if we stick to it.
This is related:
Are you a specialist of a jack of all trades?