perl has no function arg list

Im learning a little perl and everything about perl is done in the worst and most convoluted way. Prime example being that function definitions dont have an argument list but rather an implicit list that is extracted from within the function by @_.
Why is there no explicitly declared parameter list. I got banned from #perl on freenode for asking this.

Can you please explain how argument lists extracted from @_ is the worst and most convoluted way of doing this?

Seems simple and effective to me.