@Christoph-Hart Yea it has to learn which samples to keep which can often cause dropouts the first time you play. The only advantage I can think of would be that you don't have to unfreeze to make edits. So it allows you to work with live tracks a bit longer before running out of memory and start freezing tracks.
It is pretty much just a convenience thing until you run into CPU bottlenecks and are forced to freeze tracks anyway.