In 2010 WordPress seemed like important technology. It wasn’t perfect, was a big and fruitful hacking target, but it had been built and refined and had a big ecosystem.

I’m not sure how and why controlling it today is seen as an important thing. It’s not irreplaceable, you could reimplement all its basic features easily in a weekend with AI, as well as the plugins and theme you’re using with it. And you could pick a language other than PHP while you’re at it. You might have your own security vulnerabilities, but anything’s better in that department than running WP.

Why do people care about wrestling over control of this particular ship?

Definitely stay away from anything Matt Mullenweg is involved in. Part of what led up to this was a feud he had with a plug-in author, that led to Mullenweg signing his own plug-in as an update to the original author's plug-in, in the official Wordpress plug-in repository.