In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

AVRs have a very rich set of features, but if you try to use all of them I suspect you will discover conflicts that are very complex to understand.  For instance, when you use the Real Time Clock, certain communication functions need to be avoided because they interfer with the clock tick.  It really is much better to set aside a dedicated clock chip that never interfer's with other processes.  Just call it when you want the time.

On the other side, the SX-28 and SX-48 can do much the same in software, but you are free to leave out all the features you don't need.  

In sum, it is a cleaner solution that empowers you to learn low level code in a precise manner.

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