That's a neat question probably more deserving of thought than the brief time I have given it. Personally, I find music notation very impersonal, much like typing messages on a computer with this limited ASCII character set. Notation limits a composer so much that 10 performers are able to 'interpret' a piece 10 different ways and come out with legitamate results that follow the score, more or less. Adding dynamics and phrase markings are only the beginnings of describing what the music is saying, and the rest is up to the performer, which is good and bad. For the sake of comparison, I would say our spoken language is 10 times more accurate and effective than standard music notation.
yes, i think it did and does limit composers. but i think composers know this fact as well, and so they would have even strived some more to express it well in this limited language, even to a point of unconsciously making it personal already... you know, alterations, language usage, etc. chopin is the composer who used the word DOLCE more frequently than any other composer, and it somehow developed a special meaning for his pieces which might be different from other composers' usage of it.. or his accents mean differently from those by Liszt...what's your opinion on this?