Because it's difficult to tell two teams wearing royal blue and white apart at a glance. It's not rocket science.
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This is an example from last year, where we both wore away jerseys. This year was slightly better with both clubs wearing home jerseys but still not ideal. If the Warriors wore something like a black jersey (I believe their Indigenous jersey is this year) - any clash would be avoided.
I disagree with the premise that Bulldogs-Sharks clashes more than Bulldogs-Warriors, but I agree we should have something a bit more contrasting when we play the Sharks. Second consecutive post now where you're trying to pin me for something I haven't said.