I think for the sake of the technology, Canon needs to include the bigger eyecup. Right now, they want you to buy it as an accessory. Just include it as an accessory in the box. For people that don't want to use it and don't care about the eyecup, they can leave it off. But for the rest, it would be a nice bonus. Because from my tests, it's about how much light gets into the eyecup. The farther your eye is from the viewfinder, the more light leaks in. When I wear glasses (so my eyes are farther from the eyepiece), it's really unreliable. But when I wear contacts, my eye is right up against eyepiece and it works well. Also, this light leak is more likely to happen when you hold the camera vertically because of how the eyepiece is shaped to favor holding the camera landscape.It would be interesting to know the % of users that the eye controlled AF work for. It seems amazing for them but an extra cost for those that can't use it.
Clearly Canon thinks it has more universal application otherwise they wouldn't have invested (and continue to invest) in the technology.
If you look at the eyecup on the R1, it's definitely bigger.
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