Many people still use -w and for good reason. Some people like turning on warnings globally. Yes, it can be a good thing if you want that behavior. I am tired of people bashing it.

Well then I doubt you'll like to hear this: It doesnt actually work as you say it works. -w doesn't turn on warnings everywhere. It turns on warnings everywhere UNLESS a module or code uses lexical warnings. So if the module has "no warnings" then thats what happens.

Maybe you meant -W?