Why would this be a response to the Surface Book 2? Apple regularly lists and de-lists these older models in the refurbished section.
The current MacBook Pro's are completely superior to the Surface Book 2..
1) They run macOS.
2) They're standard laptops, which suit 90% of the market, check the sales stats on 2-in-1s.
3) Twice the power? It would take that on Windows to match half the speed of a Mac.
4) Better battery life? Try using it without the bottom half and see how far you get. Especially when using the GPU.. And nobody else's battery claims ever seem to be as close to real world performance as Apple's testing, so Microsoft gets no special credit until we see evidence down the line.
And if the first Surface Book was such a 'great success', then why were they selling them for £300 off each price point - BEFORE the second gen announcement. Screams low sales and consumer interest to me..