Whilst you are a network engineer, you must be aware that some of the hardware you list is entirely irrelevant to the matter. However instead of using this as an opportunity to list your equipment, why don't you have a stab at explaining why mine and apparently James's equipment does not have the issues yours has, whilst bearing in mind that unlike your computer which has many different settings, haxies, third party extensions and the like, AirPlay on my AppleTV/iPhone is exactly the same as yours.
Now on the flip side we see a constant stream of posts of people that either can not get AirPlay to work
I assume you realise this is a support community, it's where people with problems gather, do you assume that the population of the world is afflicted with broken wrists, just because there was a couple of people with broken wrists when you last visited the doctor.
I've been participating in this community for around 8 years, all topics related to the users networks are hot topics, many people just have lousy networks, it's a fact of life and it's the same if you go to any online community, Apple or not, that discusses hardware that relies heavily on networking.
Take your Apple TV and iPhone to an Apple Store, try it out under controlled conditions, then ask yourself what was the difference between using it there and using it at home, I think you'll find the only difference is the network (or the environment, which of course affects the network)