I have to hard disagree on this, but I think it might be a difference in size of company you're thinking vs. other people in this thread. Most companies where a developer will be asking this question have already figured out their product-market fit and sales pipeline. At that point and thereafter business is increasingly about "the numbers". The bigger the company, the more that is true. Understanding what "the bottom line" means for your team, department, and the company as a whole + what drives that is the core of "business".
Put another way, I don't care how great you are at product - if you don't understand what costs and margins are required to actually turn a profit you'll still fail anyway.
Large companies put people in very "tight"/narrow well defined roles (developers included) and like to hire MBAs in C-suite roles. And yes, I agree they will have well defined sales pipelines and product market fit.
Business is about numbers, yes - at all sizes of companies.
But what actually drives those numbers?
Its 1) value and 2) sales/and marketing. Its not the accounting department. That's my point.
Understanding costs and margins is crucial, yes. But its very much secondary to having a valuable product that people want and that you can market/sell effectively - that's business, not accounting/finance.
A developer asking questions about the value a product creates and the problems it solves or doesn't solve will do far better than learning accounting/finance as far as "learning business" goes or getting an MBA!
I'm not a Musk fanboy, but he has created multiple valuable companies (spolier alert, he didn't do that by focusing on an MBA but rather on creating valuable products) - here is what he has to say about MBAs in large companies:
Put another way, I don't care how great you are at product - if you don't understand what costs and margins are required to actually turn a profit you'll still fail anyway.