Letting people stay on their version of choice AND knowing they’ll get security updates for it is a huge plus for WordPress

That’s just not how software works, at all. It’s SO much work to do this. “Security Updates” aren’t this magical, modular side piece of code that you simply update, the security updates ARE the platform, it’s ALL the code. If it was that simple, hell yes, but it’s not, and it’s so detrimental to keep investing so much time and effort into dated code that needs to just die with the times.