WordPress gives you an advanced publishing platform… but it’s insufficient to manage and scale an entire business.
To get all the functionality you need for a business, you’ll need: a CRM for WordPress to organize contacts, marketing automation to get people to your site, sales tools to keep your pipeline moving, and scheduling software to book appointments. You can get that functionality with plugins, but each one comes with its own maintenance and security risks.
Plus, all the plugins, themes, security and maintenance costs that come with WordPress will add up over time.
It’s ultimately cheaper and more scalable to use a platform that comes with all the functionality and customization you’ll need, out-of-the-box.