I guess you don't have much experience buying or selling real estate, but I do.
Grab your phone. Call a few French notaries, and ask them if it's possible to buy a property with BTC. You will not find a single one...
The French can be so arrogant. I suppose you're a man, aren't you?
Just because notaires don't want to change their habits, just like accountants, doesn't mean it's impossible to buy a property with bitcoins. It's legal and possible, even if, as I've already explained, it's complicated.
Difficult, but not impossible. And legal.