If I've understood correctly, data items and collections don't have properties such as length or number of rows. OK, BP isn't a fancy object oriented language offering full scale of tools, but...
I'd like to propose that at least collections should have "Row number" as a property and strings "Length", for example. Those would be handy to use in calculations or decision without first creating an action counting the number of rows.
Did some GUI mockuping as well
🙂