Thank you for the explanation. I think your description of the benefits doesn't generalize well. This morning I did not have eHRPD for whatever reason and my morning bus ride phone experience suffered quite a bit. I suspect that what is happening is that my closest tower changes quite a few times during my ride, and every time it does I can't get data for a minute or two. Also, during peak times, I have noticed that eHRPD makes a HUGE difference. There are times when my data speed slows to a crawl for the entire bus ride home and becomes unusable. Google maps? Forget about it. So I think that routing my data through an LTE core, even though my speedtests aren't impressive, makes an enormous difference to me. Mostly I am browsing web pages which I don't think is very data intensive, so perhaps the reduced ping alone is enough to make a big difference. I can't think of any other explanation assuming I am using the same towers in both cases. In summary, I think there may not be much difference if you are still and the network isn't particularly clogged. But as a bus commuter, I am not still during a lot of my phone usage, and when at work, most of the Charlotte metro area is downtown too so the networks are clogged.
You are the expert though, so is my explanation plausible? Any other folks in Charlotte noticing a boost in performance on eHRPD days?
Also, is it possible that eHRPD DOES coincide with network upgrades in this area? Based on what you and others have said, there is no way to know just by using my phone.