In a world where bikes are becoming more sanitised and - in my opinion - a lot of new bike choices are quite unimaginative, that Griso just oozes character and soul. Yes it's perhaps uncomfortable, impractical.. all those things you mentioned but it'll probably be a bike you can just go to the garage and spend time looking at. I'd also think that amongst a long line of parked up adv bikes, this is the bike people would stop and comment upon.
On paper there are doubtless many, many 'better' bikes. But that would be to miss the point entirely, wouldn't it?