FWIW
I started using SF in the end of the twentieth century, when we where young (SF and I)
SF+Architect were the Red Book mastering tools for me.
Then I attended a mastering session with a guy using Samplitude, and I got Samplitude Mastering, as stripped down version of the main Samplitude just for Mastering/Red Book.
Amazing stuff, MUCH BETTER THAN SF in any way.
I put SF and particularly Architect into a retirement.
Magix support proved to be very good, but they dropped support for that cheap mastering version very early this century asking me to upgrade to the main "V" series DAW, I didn't.
Samplitude Master is still running on my actual PC, support gone but still rolling (went from an original install on W98 to W7 no problems ever)
As Chuck I wondered why bother with SF at all, having so many similar features inside Sonar, but I still call it (from inside Sonar "Utilities") to so some tasks that are very easy to do there and Sonar loads the touched file in a ver smooth integration, love it.
And can't see actual versions being unusable on any future Win sys, albeit dropped eventually by Magix (it is not the case yet).
I still have SF 4 in one computer....
Why changing to other sofware really?