Nobody ever sat down and decided what this website was for. A developer was given a logo, a brochure and a list of pages, and did a reasonable job with what they had. Over the years a product page was added here, a services page duplicated there, and a Careers link crept into the main menu because someone asked for it. The site now describes the company the way the company describes itself, and a visitor who arrives with a question has to work out where the answer might be. Many do not bother.
Why it persists. Website work is bought as design and development, so the planning is squeezed into the first meeting with the designer, who has neither the sales evidence nor the mandate to challenge what the owner asks for. Structure feels abstract compared with a home-page mock-up, so it gets less attention than colours and photographs. And once a site is live, restructuring it means touching every page, which nobody has time for.
If it stays unresolved. The next website inherits the current one's structure, at full cost, and the same conversion problems return within months. Meanwhile each new service, location or product adds another page to a hierarchy that was never designed to hold it.