It should be a complete set, you can't go to a battlefield with incomplete battle gear and weapons.
The most important is to focus on your skills and knowledge, creating different analyses and strategies, gaining experiences in different practices and beyond that, if you were successfully absorbing all those important things, the word profit is very easy for you.
Other traders should focus on their trading plan, new traders should have this to avoid misleading by others.
I understand your point. That you should have a trading capital plan too while learning. But I didn't say that they should totally ignore that. I just stated that it shouldn't be the main priority as the capital is useless without a trading skill.
Moreover, there are a lot of prop firm that are willing to offer you trading capital, once you pass their challenge to prove you are a good trader.