While other programming languages became mired in OOP dispute, opinion-battles, and all the ensuing problems[1], Perl 5's built-in OO is easy to learn and understand and makes the difficult things simple. It has been stable and effective for decades.
OO is just a pattern; it can be useful or misused, some aspects are more useful than others. But the defining goalposts are moved all the time. They tend to follow the hype machine.
[1] Members of the Perl community know that OO discussions have become harsh there too.
