This is a pretty crap article. This is why are so many amateurs in the PHP community.
You can ignore S(OLID) in your side project, maybe POC, but that's enough. In an enterprise application, you will need longterm maintainability. You can ignore S(OLID) in every framework if you can. That's not about frameworks, that's about being a good programmer.
Imagine some other profession. Will the doctor leave your belly non-sewn just after your surgery just because "its faster"?