It's not as robust? Do you have a source for that? You're doubtless right about it not being as widely used.

I've always preferred the fact that Postgres tried to do things correctly. Most recently, I bumped into this with Mysql, and it reminded me why I get irritated when I use it:

http://journal.dedasys.com/2008/11/11/another-mysql-doesnt-d...

I've often bumped into things like that that just irk me.