I'm developing Vvveb CMS and WordPress is very inspiring, the standard to which everyone compares in the industry.

One of the reason WordPress is so ubiquitous is that it's very easy to host and it doesn't need advanced technical knowledge.

PHP hosting is very cheap and WordPress installation is very easy, it's just one click in some hosting dashboards.

The Javascript ecosystem is complex, you need to be a developer and have access to command line to install most Javascript CMSes and need a vps or more expensive hosting.