- Will you get exactly the same training result for your centerline, structure, relaxation, energy, stance, rooting, etc etc?
- Is there any reason that you have to follow the original order?
- If you break your Siu Nim Tao form apart, re-arrange the sequences, do you think you will understand the Siu Nim Tao form better afterward?
IMO, the original form creator doesn't care whether you break it apart, or re-arrange the sequences. After you have learned it, it's your form and you should have freedom to do whatever that you want to.
Sure, often the best way to train any of the forms is to take a small section and drill it over and over. Then you can work two-man drills based on those movements, and finally apply them appropriately in random contexts such as chi-sau and sparring.
On the other hand, the order of the movements in the form is not random at all. Many sequences are arranged quite logically. And I doubt whether a student would grasp the underlying concepts any faster by simply scrambling the order.