showing Tom had talent too
Seeing this years later it seemed like they were showing that Tom the ostensibly dim witted news anchor actually had some interesting talent. The scene where he handles the pressure of live delivery mixed with Holly feeding him info all the while appearing very collected seems to show he was in fact bringing some good stuff to the table. That in contrast to the other Albert Brooks falling apart completely doing the news...
I don't think I saw it this way when I first saw the movie years ago though.