The WordPress ecosystem spans the gamut from my-first-site through to massive enterprises, so you’d have to expect that many sites you see are in the long-tail. At the higher end, it’s no different to any professional software ecosystem.

There’s also varied ecosystems within WordPress, as it’s large enough to support many. For example, the DAM integration cited in the article isn’t something you’ll find on many sites, since it’s an enterprise use case; we don’t even list it on the official plugin directory at all. Plugins and libraries used on enterprise sites are basically a separate ecosystem unto themselves.

(I manage the team that maintains said DAM plugin.)

Because most people don’t know how to host and maintain web software. Hence the growth of fully hosted platforms like Squarespace, Wix, Webflow, Shopify, Etsy, etc.

That’s not really relevant to how enterprises decide on web content management software, though.