There's the problem. The discovery is not easy for 3D Touch. This was a problem for Apple at the time it was launched. They had several features that were difficult to discover in normal use. Most people probably have no idea the feature even exists. Also, as you said, those that do know, it is only a convenience feature. So while the poll may show an overwhelming majority of MacRumors users taking advantage of it, the statements in the thread seem to indicate that many of those that use it wouldn't miss it.
It had potential, but inconsistent and lackluster implementation have made it mostly irrelevant, and if it can save money or reduce complexity, it should probably be axed.