I worked in a company with a few hundred employees. The majority of people in the company and almost all in managerial positions have had zero high school education in general studies, many started with about a 4th grade level in English... That didn't hold them back of selling and operating 100s of millions in sales a year, and people in the accounting department becoming CPAs etc. etc. This is the same in many (most?) frum companies across a broad range of industries.
While I think we should all have a basic level of general studies education, anything more advanced than 6-7th grade can be later on in life as it pertains to an individual's employment/business, and in my experience, people learn concepts in weeks or months that are taught in school over many years.