The reason is structural rather than a preference. The platform distributes content from people far more readily than content from company pages, and users engage with a face rather than a logo. A post from you about something you learned will reach a multiple of what the same post reaches from a company page with a similar follower count. For a business of one or two people, the company page will realistically never become a meaningful distribution channel, and treating it as one wastes effort.
The company page still needs to exist and be complete, because it does a different job. Somebody who hears your name checks whether the business is real, and an empty or missing page reads as a gap. It also lets employees list you as their employer, appears in search for your business name, and provides the place a job listing or an advertisement would run from if either ever becomes relevant.
The practical allocation is to complete the company page once, properly, then leave it. Name, description, location, services, website, a decent image, and enough activity that it does not look abandoned. Reposting your personal content there occasionally is sufficient. Then put your actual effort into the personal profile: a headline that says what you do for whom rather than a job title, a summary written for a customer rather than a recruiter, and posts that demonstrate you know your subject.
The consideration nobody mentions is that a personal profile follows you and a company page does not. If the business changes, the audience you built as a person comes with you. That asymmetry argues for the same allocation for reasons entirely separate from reach.
Write the headline for the person reading rather than as a job title, since it appears everywhere your name does and is the single most read line on the profile. Something naming who you help and what changes for them will do more than your role and company. This is the piece that determines whether somebody who encountered your name once bothers to look further.
Be deliberate about connecting rather than accumulating. A network of people who could plausibly refer you, hire you, or partner with you is worth considerably more than a larger one assembled by accepting everything, because what you post reaches your connections and a diluted audience reduces the reach among the people who matter. For a local business particularly, connections in your actual market are the ones that produce anything.