In my experience the OBA content and stability over time is indeed an important consideration. First of all the paper base LAB changes over time shown in the Aardenburg data can't be dismissed. Secondly, for myself and some others, excessive OBA results in less than the best prints. Highlight subtlety, finesse, and a pleasing presence seems absent on these papers. The blue hue itself is a problem, no matt board matches, making highlights seem off, and I've had very subtle near white yellows go gray and just odd looking. I realize this is a subjective judgement and others may prefer the look, but the difference in "presentation" is very real. So that, as well as the longevity problems, make these papers less than desirable for some of us.
Thank you for the detailed post Ernst, very informative. I agree there should be some non-rag papers utilizing methods to get to a neutral white without OBAs and hope some come on the market for a wider range of price options. Also, the Epson papers you mention prove there may be better ways of incorporating them as well. I hope a non-rag photo surface paper shows up that is moderately prices, shows a more stable base hue, and is somewhat neutral, I'm still ooking.
I did notice with interest Canon Photo Paper Pro Luster LU-101. It may perform a bit better than others, but I find no sizes other than desktop sheets.
So I'm still looking and interested in recommendations. Obviously there are many papers that have not been tested.
T