This would probably have meant that the Mac wouldn't have become so popular amongst developers. At least that was the reason for me to switch to Mac because it's a "proper" UNIX with a window system that actually works ("Linux on the desktop" has mostly caught up in the meantime, but 10 years ago that was quite different).
BeOS was less compatible. There were also many improvements to it in the later versions. When NeXT bought Apple[0], BeOS was not even in its pre-release phase. Its heyday, such as it were, was really on Intel, with R5 and the Personal Edition, in the last few years of the 90's.