If you introduce any amount of latency by executing the encoder/decoder pair, you'll have to subtract double the latency from your ping-allowance.
If you try to have correctly-lipsynced audio in a video call, I only know of one setup to offer similarly-low video latency: a rolling-shutter in the camera, a line-by-line display (CRT should do well), and up-to a few lines algorithmic delay for e.g. running non-buffering JPEG (8x8 DCT and an online entropy coder (no pre-analysis for optimal Huffman tables or such) to save like 80-90% bandwidth). Analog TV camera+screen hardware should also work, but it's really inefficient and not easy to emulate with digital hardware.
The other companies, who pay on value of output, will agree with that statement. As far as I know, most companies fall under cost of life approach rather than value of output.
I think most companies fall under "what's the minimum we can get away with?"
>what is needed to retain employees and keep churn rates down to acceptable rates
Ultimately, this value depends on the location. Assuming identical salaries, it is more expensive to retain someone for 5 years in NY than in Nebraska, because the person in Nebraska making $200k+ lives like royalty, and whereas NY would be a different story.