WEI is not meant to be a precise measurement of performance.
It's an indication of how your rig compares to others.
Maxing it is more psychological for me.
It's another way of asking which SSD and GPU card is the best.
Actually, if I just asked it that way, people would post "I have X and I recommend", and another guy would say "I have Y and I recommend".
Now what? Which do you buy?