Goodness me.
Do you honestly believe that the butterfly mechanism was designed for any other reason that to provide less key travel thus allow them to keep making the notebooks thinner? If you do i've got some magic beans for sale.
That was exactly why they designed it. No one has suggested otherwise.
You've even accepted it yourself, you can't make scissor mechanism with less travel so they designed a whole new mechanism.
Yes they did. Again no one is disputing this. You are arguing with someone that doesn't exist...
The fact that they don't use the butterfly mechanism on their own wireless standalone keyboard says it all. They know its a compromise.
It doesn't say that much actually. Why would they rebuild their magic keyboard that doesn't need to worry about saving 1mm of height with either the current butterfly switches on the rMB or with new longer travel ones when they have a working product that doesn't need changing?
If you didn't take things quite so literally you might realise that we are saying that apple could easily create a butterfly switch keyboard for the new rMBP that has more travel than the rMB one. It doesn't have to have as much as the scissor mechanism ones and it doesn't have to have as little as the rMB one. It could be somewhere in the middle.
The pictures leaked look like a low profile keyboard. People are whinging that it will be the exact same as the rMB. It won't necessarily. Its a super simple argument.