question: can anyone give me a reason why OWL should have datatypes?

So I was looking over Owl
http://www.w3.org/TR/2002/WD-webont-req-20020708/

When I found yet another case of interlock with WXSDL(under
section-use-cases; R15. Complex data types). The motivations given were
compatibility with other standards, and ease of use.

Anyone excited about this and think it's a good idea?
Anyone over-excited by this and think it's the worst idea since
one-dimensional bread?
I got a gut reaction that immediately spun me into the second camp, am
looking to climb out and learn to smile, smile again.