I would be a little happier if the newer skirt and raft merging functions were optional. I don't like that this "improvement" was added, and the old behavior was simply removed from the software. I had a lot of tricks I developed that relied on the old behavior where each process could have it's own raft and skirt settings. Now, this merging logic messes up many of my old factory files which relied on the old behavior prior to version 2.2.0. That's pretty upsetting.
New features should not cripple or remove old features. That's not the way to go. If the behavior needs to change, the change should be an option in the settings somewhere, so that older factory files still work properly. There is currently NO WAY to get my older factory files to print properly, which relied on the old behavior without going back to an older version of the software.
Backwards compatibility is important for successful software packages.
I think the Simplify3D team needs to more carefully look at this. Having factory files that no longer work in newer versions is a major letdown. If this keeps happening, people will choose other software.