This, to me, is the biggest issue. I use two SIMs, and was very disappointed to hear that I will not be able to use a banner new feature because I'm using another, existing feature.It’s about Apple not being honest with people spending tons of money on a new phone.
If Apple had disclosed this up-front, I would still have been disappointed, but would then be purchasing knowing what I'm buying, versus finding out after-the-fact.