I wonder why this issue gained so much momentum with the 5D3 and 1DX when the 7D behaves the same and it's on the market for some time.
Well, whatever the reason, I'm glad that they are finally doing something to improve it.
Two reasons, I'd say. First, many complaints are from 5-series and 1-series users who probably have no 7D experience. Second, subjectively I'd say the red light illumination on my 7D is 30-40% brighter than on my 1D X.
FWIW, I mentioned the issue with ultrafast lenses washing out the transmissive LCD, although it certainly wasn't phrased as a complaint.
I shot in AI Servo last night, outdoor concert, relatively poor light, no problem seeing the AF points. In auto selection (which is my preference in AI Servo because it allows the subject to be tracked through the extent of the AF array and also activates the iTR system on the 1D X), the AF points 'dance' over the subject, making them pretty easy to see - even a Louisiana jazz musician's face.