In the hierarchy of musical priorities, dynamics have often appeared to me to be relegated to fairly low niche and left there to languish, their immense potential for beauty and expressiveness being overlooked and ignored. Even in recordings of professional orchestras it is not at all unusual to here a crescendo or diminuendo begin and end without any unified idea of where it is heading. Concerts or recordings where the music making is otherwise of a very high calibe all to often approach the dynamics with far less care and intelligence than other musical matters.
Every musician knows what dynamics are and will tell you that when they see an mf on the music, by golly they play mezzo forte! And when they see a crescendo to a fff, watch out, buddy!
Crescendos (or crescendi, for our purist friends) seem to bring out a primal Darwinian, survival of the fittest impulse in many of us. If you can do it, e.g. low brass, most percussion, etc., then do it. If you cant, e.g. low register flutes, middle register clarinets, etc., then get out of the way. It is quite understandable. After all, you flutes and clarinets get all the great melodies and technical calisthenics...