Right, but that's a large, core Symfony component, not a small library. It essentially dictates how you handle fundamental tasks (such as routing) and immediately starts you off doing things the "Symfony way".

Or go work on original problems that have not already been solved dozens of times. Projects like this are a waste of talent. There are clearly some smart programmers writing libraries for PHP. The question is, why do they keep writing the same stuff, over and over? All of humanity would benefit if some of these smart people focused on doing something domain specific (medicine, law, education) or dove deeper and helped re-invent the stack at a deeper level. Maybe re-invent PHP as a language that has primitives for concurrency. Or leave PHP and work on other problems that plague the tech industry (the obsoleteness of HTTP/HTML as a way of delivering documents, when people increasingly want software over TCP, not documents).