You definitely should "annotate" arrays with their expected sizes, but if you're doing a lot of broadcasting operations it can get pretty verbose to write out those tables over and over.
That said, yes, you definitely should at least make an attempt to clarify your broadcasting logic if you want to be able to read your own scripts in a month from now, let alone write maintainable production code.
That said, yes, you definitely should at least make an attempt to clarify your broadcasting logic if you want to be able to read your own scripts in a month from now, let alone write maintainable production code.