I'm not sure if you got the problem. It's not about checking stats every day. It's about a discrepancy of 11% they show on "Estimated earnings, Last month" and "Finalized earnings, Next payment". This stat does not change a whole month and should be more or less the same.
I also do not complain about Adsense in general. I did a lot of tests with other ad networks and Adsense just pays higher rates.
I complain about the fact that 11% from the earnings are deducted, rendering the realtime stats of eCPM, valuable for e.g. calculating direct advertising rates or comparing Adsense to other networks, improper.