Different shrimp have different tastes I guess. I have red cherry and goldenback neo's in the same tank (same species just different colours). The red cherries like to comb the moss, the goldenbacks like to hang upside down from below the floating salvinia and sieve the water's surface. I've never seen any of them actually eating the almond leaves though, but having said that, I can see a CRS that is happily munching on the algae that has grown on a leaf that has settled in the tank's brightest spot. The CRS seem a bit more shy that the neo's and enjoy hiding under the leaves too, but maybe just because they are younger / smaller.
So basically I think we just have to believe that they're doing good in our tanks. Or maybe the almond leaf parties only happen in the dead of night when we're not looking?