I know, but the Viduy on Yom Kippur itself is much more important and usually has more feeling.
Also, that’s their greatest contribution to those who can already learn. Obviously, the Gemaras are their greatest contribution to K’lal Yisrael as a whole. (And the commentary to the Chumash is also amazing. When answering people’s questions on Chumash, I found that almost 9 out of 10 answers were found in the Artscroll notes).