h98, are you saying that with APFS, bootcamp in Windows 10 will still allow you to boot back into MacOS? Devon is stating a no-go for him. With a non-EFI GPU, that is the only possible way to get back into MacOS, so I will wait until that continues to work perfectly...
And Vice Versa. Without an EFI GPU, you cannot boot into Windows from MacOS unless Boot Champ works perfectly.
Currently with Sierra, disabling SIP does the trick for both ways.
Yes, it's a pain sometimes that it will always boot back into MacOS after that initial restart, but that's manageable. It cannot get any worse for us dual-booting folks, and the level where it is now is "acceptable." but nothing less, please.