"The only advantage that I see is that with my guide I have to make sure I keep the saw up against it while a track saw runs on tracks."
Yes, and you hit the nail on the head with this observation. It is difficult to make a long rip, say 8', without repositioning your hands or the trailing power cord or taking steps and repositioning your body. Resulting in a bobble with the saw moving away from your guide. We have all used saw guides for years thinking we don't need a darn ole track saw...………… until we buy one and think why didn't I get one of these years ago? The cut may not be any better with the tracksaw but there is some value for the easy of operation and the smile on your face.