First of all, I would say that (KE) it is extremely interesting to look at the performance of any account. Their staking and Earning rewards.
I usually try to curate accounts that have a low KE ratio.
Secondly, I agree with you that KE should be placed next to the reputation score, as it would then be easily accessible.
RE: PeakD should add KE ratio near Reputation score when browsing through user content