I'll give you a few examples of blind bunkers on a course that seems remarkably respected, NGLA, and how strategically effective they all are:
Hole #1:
There is a set of totally blind bunkers left on #1 that can catch a conservative iron tee shot incredibly easily on what many players seem to think is the right line---it isn't!
Hole #3:
The blind bunker short of the green in what would otherwise be a pretty easy blind run-on shot to the green.
Hole #7:
A blind bunker that's around the conservative tee shot line.
Hole #9:
The blind nest of bunkers down the left side on the tee shot.
All these bunkers are blind and just remarkably effective strategically.
There are other blind bunkers on NGLA but the ones above I think are the most effective. It shows me that blind bunkers have a very fine strategic use and that the generlization in modern golf that blind bunkers should never be used is somewhat thoughtless.