Professional astronomers have some good reasons for using parsecs. I listed a few in this little document written more than ten years ago.

http://stupendous.rit.edu/richmond/answers/parsecs.txt

It's likely that the answers will be just as good ten years from now.

If _you_ don't want to use them, fine. No one is forcing you to do so. If you want to read the technical literature, though, you'll have to understand them.