I can’t answer this, since there is no option for: Give us more than 8 inserts. They would need to do a new version like Pro Tools did: You save as the older version in order to open the project again in older versions. You can’t open older versions in newer versions. Worked fine for Pro Tools, didn’t bother me one bit in the name of progressing things. Sometimes to get into a much better place you need to make a minor sacrifice like that, so my opinion is that Steinberg doesn’t need to worry so much about backwards compatibility at this point. Work on older projects in the older format if you need to, then import older into the newer format if you need the new features on them.
That’s the only way it’s going to work, unless they figure out a way to make it all compatible (which they haven’t been able to in a long time it seems - so let’s move on to an option that works).