HTC doesn't develop the hardware for the core components - they buy it from third parties. In this case, they wanted the best screen on the market at that point, and it was the AMOLED display. It's deficiencies were known since day one, and Google/HTC decided that it was worth it anyways.
It's impossible to determine when your R&D has reached an "end".
Thanks for the detailed response. The issue with that is, Sprint is essentially starting over with 4G coverage - neither AT&T nor Verizon would support TD-LTE, so Sprint would be left to it's own devices (maybe with partnerships) to get their footprint up to snuff.
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