I have never owned either machine, but I would say it is like an old car (as you said.) After a while, you can't get parts or find anyone to work on them. Old/ancient Singers are the obvious exception, but a ten year old Husq that is starting to have problems like circuit boards is going to rapidly become a specialty item with respect to repairs. Your DH is a gem, and I would love to hear you gave him some strokes for doing such a nice thing, when so many would have come home with a dead machine!
There are several Ruby owners here, but you may not find them on the machine embroidery thread. If you don't mind, given your time constraints, I am going to flag one of the mods to move this to the machines area. K