Thomas -
for me, I think the case for leaving bunkers un-raked and un-manicured has been overstated: even on the Tour, with the greatest golfers in the world playing out of the most consistent (and consistently groomed) sand conditions possible, bunkers still prove to be 'hazards' -- maybe not as severe as we'd like, but certainly (given that the pros get up & down out of those bunkers, what, 50% of the time?) costing them strokes they'd otherwise not likely have lost.
But on your other point: yes indeed, the notion of bunkers showing up in an 'haphazard' way (or at least seeming to) is very appealing to me -- if not so much in terms of 'hazards' per se as in terms of strategy and visual interest/engagement and variability (with changing wind & turf conditions) and a pleasingly naturalistic aesthetic. It's one of the main reasons I want to play Tom D's The Loop (having never been to GB&I), as the reversibility of the course(s) means that bunkers there have more of a naturally occurring & random form & function.