Late to this party, but to me the final straw is that the SAW has better uptime. BRIONAC is a great skill and is an A+ when you're killing shit that comes in multiples of 5 but the Sea God Gun is 80% as good in that situation while being better against anything less than that. It's a worthy upgrade overall, it's just low priority because the original is no joke. It's hard for SAWs to shine when the base skill doesn't leave much room for improvement without becoming overpowered. I think of it as the Curse of Elizabeth.