Water Heater Drain Valves..are they worth it?

I have used a water filter with my camper since new, so I'm really wondering just how much sediment and crud I could have in my HW tank that would require flushing?

I don't necessarily mind pulling the plug, but what I hate is all that water splashing into the compartment. It wouldn't take much of a leak in the corners where the hinge/sealant is, to allow a lot of water behind the wall.