Lovely stuff - if this had support for IFC I would be very interested.
I can hardly imagine building something like what I wish this was but failing to share the details of specific attribute support between each format. I am essentially the target audience for this (or not nearly gullible enough depending on the intent) and not coincidentally this isn't my first time on the internet. Regardless how amazing this tool is, I would statistically be a fool to get off the couch for 10 minutes to experiment with it, so I'm not going to.