English is not my native language, and it took some time for me to actually parse those short variable names you provided as examples. Though, I still don't know what propCnt is supposed to mean. But even if I did, it takes some cognitive effort to parse shortened names. I think that's the case with native speakers as well, but it's more noticeable at non-natives because the time interval is longer. IMO those little parsing efforts add up and are tiresome if you have to do it all day long. Imagine if the books are written that way.