You obviously haven't spent much time in internet marketing. People who are somewhere in betweeen a non technical user and developer are productive because they use Wordpress for everything. There are entire ecommerce stores built around Wordpress. At this point Wordpress is like an operating system for web apps; it doesn't matter what the apps do, only that they're easy to install/run/customize for semi-technical users.

Wordpress is effectively the operating system of the web. It's much more than a run-of-the-mill CMS.

It doesn't lack all required features.

If you install WooCommerce you'll see that it's a full-blown e-commerce that can do receipts, track orders, and just about everything else.

I recently used it for a client website, developing all the stuff that they got for free would've cost 20,000.

I don't love WordPress, but it's extremely convenient if you don't like to waste time rewriting stuff that is already available as free, debugged software.

Another angle: Why wouldn't you want a CRM you can host in the backend of your landing page for no extra cost or on its own for $4/mo? :)