It isn't "random", a as business process develop over time to various business/customer/regulatory needs. The business process evolves over time typically.
When you take a business process, you are often formalising it. The fact that you have no appreciation of this, tells me you don't really understand what you are talking about.
> Understanding low level code puts you on entirely different level because you can reason about a problem using logic and how systems operate.
You have to do this in high level languages as well. It isn't something that only low level devs do. In fact to be able to write any good code you need to understand the problem domain.
> No disrespect to any crud devs here but from my personal experience they just know a particular implementation of their domain and rarely even consider how the code base even operates as a whole
You are literally disrespecting them by saying this. It is also false, what you are describing is developers having deal with incomplete/poor specifications and poor documentation. BTW this is rampant through the industry. I wanted to do some stuff yesterday with Docker and Go, the documentation is non-existant.