Why would it matter the reason of dropping a file of X size? The point is that not all applications are "decent" and some will undoubtedly use /tmp because "it might be the most logical thing" for any developer that's not really up to date.
I don't see how reviewing the tmpfs helps in this scenario if at all... we are talking about end-users your common joe/dane running your day to day applications, whatever they may be. I don't and will never expect developers to adhere to anything and just put out whatever.