Comment by kevincox

My main complaint about GCs is that they only clean up one type of garbage, memory. Maybe you can increase your file descriptor limit and let them deal with some other resources via finalizes. But they aren't tuned for that and there will be some types of resources (locks, temporary files, worker threads, subprocesses, ...) that you need to manage on your own. So now you have at least two forms of resource management in your program.