There's more to it than just blaming Apple, I've been doing some extensive testing with a Netgear R7000 and an RT-AC87U. I set them both up in the exact same spot, with the exact same wireless setting, both on their respective stock firmware. I first test the R7000, the swap that out with the AC87U. I test each one for at least a whole day without turning off or moving.
Currently my R7000 is much more stable on the 5Ghz network with no slow-downs or disconnections on all my devices, my AC87U struggles so badly I almost feel bad for it. Constant disconnects, extreme slow downs, and I currently just threw it in the closet until we can get a firmware that has stable wifi. I bought this with the idea that I'd sell my R7000, but I'm glad I held onto it.
I test this with my iPhone 6 Plus, One Plus One, iPad Air, Macbook Pro, and my Lenovo W530. Across the board I have issues on the 5ghz network.
The worst is when I'm connected to my work VPN on my Lenovo and I get constant reconnects to my VPN network, on my R7000 I get none at all and have a stable connection all day. When it starts to affect my work is where I draw the line.
So there's more to it than client devices, it's something really wrong with AC87U. I'm hoping ASUS/Quantenna comes up with something soon, I really want to like this router.