For what it's worth, I asked HTC customer service about the issue (specifically about the Incredible). They may have been confused about which models are/are not being equipped with what screen, but this is the response I got:
"I understand the importance of knowing what hardware your device is equipped with. As a course of normal business, HTC sources certain components from more than one vendor. However, all of these components undergo the same stringent testing and must meet all of HTC’s quality and performance specifications before being certified for use. Tested and approved displays have been sourced from two different suppliers which both exhibit virtually identical performance characteristics, and have both been in use. More than likely, a newer device will be equipped with the newer hardware, in this case the S-LCD screen. I hope we have answered your questions in detail."
Hopefully it's just a stock response and with someone who doesn't know which phones have which screens, but it's interesting to note anyways.