Mmmmm, no that's not why. The sound lag will be fixed as soon as it can be, they're working on it. Now granted I don't know how long you've really been looking at update logs and things, but this question has definitely been asked many times, so a simple search would have gotten you a similar answer: It's being worked on. Asking about it won't make it go any faster at this point.
And having different program versions for different platforms is just a bad idea. You can export your game on only one platform if you want, but you're not going to get any improvement from having a windows-only version of the software. MV was rebuilt from the ground up to be a more stable program, having them rebuild different program versions form the ground up would not make anything better, and would in fact make things much worse because they'd have to worry about maintaining man different projects and versions.
