If the ram's power use is the main problem, then that disproportionately affects low-power uses. There's no reason to think gaming would have a similarly crippled battery life.
Any idea how long the MBP lasts if you peg the GPU?
I wonder if it would be possible for the OS to consolidate "hot" memory into as few modules as possible and power down the ones holding relatively cold data when memory pressure is low.
Any idea how long the MBP lasts if you peg the GPU?