Aesthetics:
The use of different supergrasses distinguishes many of today's bunkers from their originals. It further portrays just how far we have strayed from the initial character of our original classical designs. Native fescues, whether you label them "prairie grasses", "blue stems" or "Scottish broom", surrounded many original bunkers. These were the type of grasses which were native to classical designs. Tillinghast, CD, MacKenzie, Maxwell etc.and their contemporaries simply did not have the variety of grasses available to us today. The character of the course was centered around the look, the "natural" look, of these tawny, wispy fescues.
Newer grasses have a manufactured look. Secondly, maintenance practices are different today. Notice the rugged, weathered look of the bunkers below. Notice the jagged edges which are naturally integrated into the surrounds.
Today, many of these bunkers maintain a rounded and upholstered look. The edges are well defined, cleanly cut and manicured. These are the ingredients for today's generic bunker style, the very type which were foreign to the classical architect. Consequently, bunkers have lost their natural appeal, their style, and their intricate shapes.
Look at these beauties below: