I still say yes, they are strategic, maybe moreso.
At the very least, if maintenance has evolved enough to make them "easy" to play out of, then design can evolve to restore some of the required difficulty, i.e., depth. BTW, its also an equipment issue, although one would presume that when "all" bunkers become perfectly smooth, then the sand wedge will be eliminated (for thoes courses anyway) giving the golfers another option for a more useful club, too.
That said, I also fall in the camp of the possibility that old time bunkers were too difficult, not that today's are too easy. Certainly, Bobby Jones thought so when he built Augusta. Any thinking golfer will most likely just avoid multi stroke penalty bunkers like they avoid the water or OB. I believe that to challenge any bunker, players need a sense that they have a 66% chance of clearing/skirting it, and a similar chance of recovery, or they just play wide.
Not to say a hole with just one really well placed bunker cannot have that one deeper.
Lastly, why is it we always bring the Tour Pros into it, and think of design in terms of what stops them? They constitute about 0.000001% of play. Is it worth designing just for them, anywhere except on a TPC course?