Freezing tracks is a great cpu and ram saver. I often use it when composing or even when mixing. Some people may bounce a channel after applying eq, compression or whatever effect they use.
The downside of final bouncing is that we cannot readjust the settings of effects we apply in later stages in the mixing. I find that I very often need to make some micro or more extreme changes in the individual channels while going further in mixing. It is important not only that each different channel has to sound great but it needs to sound great in the whole track / song/ score.
Freezing the individual channels not only allows to keep the adjustments we did but also we could make any changes we need in later stages and still keeping sources for our computer to work smoothly.