I need something that will open old FH files, but continue to work with new Mac OS down the line. I am not a graphic designer. I use FH for my own pleasure and many things such as greeting cards, presentation of my illustrations, etc.
So my needs are possibly not as great as yours. However, when I want to have things printed by a printing company and not just on my RGB printer, I may need to be able to output CMYK and separations.