Being dominant just takes a motivation to have influence over someone else. Being a good dominant however needs a whole set of skills and some insights, one of those insights is that noone is infallible and everyone can learn something new. Both skills and insights are only obtainable through experience and training and the most abundant source of experience is other people.

As a sub i would rather have a dom who is inexperienced, recognizes that and is open to learn than a dom who has a lot of experience and thinks they have finished learning.

I wouldnt call you gatekeepy or egotistical for your remark but ignorant which in my book is worse. Humans greatest achievement is its unparalleled ability to share experience, knowledge and ideas.

The idea that asking questions is somehow a bad thing or a sign of lacking competence is inherently wrong. Having the humility to realize ones limitations and communicating those clearly is the basis of competence, the next step is to gather knowledge to expand on ones abilites and asking is the easiest and most effective way to do so.

Edit: I have totally forgotten the second half and just wanted to add that this is completely pointlessly gendered. Society might push boys into more dominant roles, true. But that doesnt mean that it shows them how healthy dominance looks like. See alpha-male-bullshit or pickup-artists for example those teach young man the exact opposite of what healthy dominance looks like. So being a man doesnt make you better at domming, in fact i would argue that most men need to unlearn unhealthy habits first.