Thank you for your thoughts.
Generally sand bunkers these days present less of a hazard than they once did and also, due to the desire of some to have them almost manicured, they seem to take up quite a significant amount of maintenance time, as has been discussed on several recent threads.
Would having some grass bunkers, or rather hollows, that are revetted - or indeed some other type of firm angled face (sleepers?) that doesn't need to be mowed - be a way of having an occasional really severe hazard, one that shouts to you "I'm nasty, take me on if you dare or stay away". And if the base of the hollow has a few divots, well so what!
Atb