When you start a company you quickly encounter a long list of things you are supposedly supposed to have. A business plan, a budget, a marketing plan, a board, an office, bank credit and a lot of other things. They are often presented as obvious requirements, almost as if the company cannot exist without them.
When I started my first company there was really only one thing on that list that felt necessary, and that was an office. Not because it was business critical but because remote work was not normal at the time. Today I probably would not even have needed that. The rest were mostly things that sound professional but do not help very much when a company is just getting started.
It is not surprising that the advice sounds like this. Many of the recommendations come from advisors and organizations that want to see structure and planning because they are employed by the state or municipalities and have never really been close to a real company. The reality inside a newly started business rarely works that way. A business plan or a budget is mostly guesswork when you still do not really know what the business will look like.
What actually matters in the beginning is much simpler. Get a customer. Deliver your service. Get the next customer.
Of course you need to keep track of the finances and make sure you do not spend more money than you have. But that is very different from spending time on documents and plans for a business that has barely started. In the beginning time is almost always the most limited resource and it should be spent on customers and delivery, not on paperwork that mostly exists because someone thinks it should.