I think Matthias’ demo shown here is best to be taken as an early proof of concept demonstration and all credit to Axyn for this clever application and Matthias for actually doing it.
That’s exactly what my demo was meant for: a proof of concept. Nothing more. Will have to wrap my head around the (highly welcome!) comments and criticism about potential disadvantages of doing things this way. But am also happy to have kicked off such an intensive discussion about this WordPress/iFrame/RapidWeaver topic… :-)