Isn't one washer easier to lose than the previous system of multiple washers?
Allow me to quote myself:
You could for instance use the washers to hang 400 kg of concrete from your ceiling. After all, you're dealing with construction material. That'll make it hard to steal.
With just one washer, and text only on one side, I'd just mount it somewhere. M14 might look a bit out of place because of the size, so don't use it to hang a painting, but for sure you won't accidentally lose it.