Final keywords–like locks on a door–are just a suggestion. If someone wants to light a stick of dynamite and play hot potato with it, that’s their own problem. As long as they aren’t wasting upstream dev’s time or publishing packages that depend on this to work, it’s not worth getting upset about.
Just because one person said “final is bad”, the Laravel fanboy herd is flocking to solutions like this. In my opinion, the package per se is not bad, but the unreflected, absolute statement “final is bad” is the problem.
In my opinion, the package itself is bad. It suggests by its very existence that final is bad. It tempts to use dependencies in a way that was not intended by their developers.