The article began, "It’s true that I had largely been moving away from the WordPress project since at least 2017." Also, the author didn't say that he regretted contributing to WordPress.

Things change, and you move on. If someone got divorced, would you say that's a good lesson to never get married?

Well you are over indexing on someone by getting married.

Whether after 10 years you don't end up regretting the decision or not is something you probably can't control.

Marriage like any other social constructs primarily focuses on preserving culture in sacrifice of individuals.

You should diversify by having multiple families.

An estimated 40% of global websites use Wordpress in some way. It's hard to come up with a more generally applicable set of skills than "Wordpress" at least based on total users worldwide (I'm not here to defend WP, I've never liked it)

That said, I don't think the author's experience with Wordpress has poor transportability into other niches anyway.

Wordpress saga is spicy in itself but really this is also a wake up call for any programmer like me who is overly dependent on a single technology such as dotnet or java. However, what else can we do? There are only so many hours in a day. What reasonable alternative do I have?

Sightly different comparing a cms to an entire programming language. A more apt comparison would be your career being entirely focused on Umbraco or OpenCMS rather than dotnet or java.

>>but really this is also a wake up call for any programmer like me who is overly dependent on a single technology such as dotnet or java

Java is open with competing implementations from Oracle, Redhat,AWS and of course OpenJDK and several other providers.

Aren't all these distributions of openjdk, therefore largely being the same codebase?

Yeah, there’s really two main implementations of Java - OpenJDK and GraalVM. Both are decently mature/stable.

There is IBM OpenJ9, which is compatible with the latest versions of HotSpot.

IKVM.NET is active but only supports Java 8.

Oh, never mind lol

Using only open standards and open source with a suitable license.

Being disciplined about this is very difficult, see RMS. But it is the way.

I mean, Wordpress is open source with a suitable license (GPLv2). You can install plugins from wherever you want.

So is every piece of software implicated in this drama, including Advanced Custom Fields (free edition)

I really don’t see how the discussion of open source pertains to Wordpress

html doesn't have this issue :)