Quite....That makes sense to me. Since you mentioned "..a bunch of speculation..", I would say that one good thing about such test results is that because of such tests, we don't have to speculate as much. As you pointed out, a lot of the owners are not experiencing the "ramifications", and that's not surprising because it could simply be that in their usage, the "pull back" behavior Amir found, might not have been triggered, or triggered but not noticed by the owner (as Amir found, there was no indicators). Just like your specific speakers did not do well with your Integra and you noticed it, yet other owners may not (unless the unit actually shutdown).
Having seen the test results, potential owners can make a more informed decision. For example, if I had the kind of uncommon impedance/phase angle characteristics speakers like yours, the RZ50, and its Pioneer, Integra cousins would not be my choice. Since I don't have such speakers and have no plan to acquire anything like them, the RZ50 would be on my short list if I needed an AVR.
In my opinion, ASR is a good place for people who prefer objective measurements to help them make their choices. Those who don't like the results and/or questioned their values would still benefit from the information, that again, should help them in making more informed decisions such as to avoid the DUT (the LX505 in this case), or not, based on their needs.
However my analysis of AVR's and Prepros around this price level, did not indicate any that would provide confidence with their ability to handle my speakers - ultimately all contenders were suspect in terms of very low impedance handling.... so then it became an issue of their suitability to run surround/height channels, and effectiveness as pre-amps / processors. (ie: after my initial analysis, I was fairly sure that I would need to use my power amps regardless which AVR I went with... unless I was willing to go up to a much higher price category - and even then...)
Shortlist ended up with Anthem, Denon and Onkyo/Integra.... I wanted to move away from Audyssey.... and then decided I preferred to try out Dirac based on the many positive reviews I was reading (and a couple of impressive listening sessions at audio shows a few years back).
So, not overly concerned about the power amp weaknesses - and the processing and sound quality strengths are excellent.