Just to pointed out this peculiar rules section:

3. Frequency Bands and Qualifications

An operator of an amateur station may operate within the frequency bands set out in the attached Schedules I, II and III in accordance with the operator´s qualifications identified for the specified band.

This is the way Australia has headed. The bands are listed with the allowed bandwidth for each band/licence class. There's no legal requirement to stick to specific modes, except in the case of Foundation licensees.

For example, with an Advanced licence I can basically use (subject to restrictions in some areas, where interference to non amateur services is an issue - e.g. 6m in most of the country is limited by the presence of channel 0 TV).

Bandwidth is defined as "necessary bandwidth"

160-12m - Any mode with bandwidth up to 8 kHz 10m - anymode up to 16kHz bandwidth 6m, 2m any mode up to 100 kHz bandwidth higher bands - any mode (within band limits)

Mode segmentation is not legally enforced, but like Canada, they are maintained by the WIA in the form of band plans, which are essentially gentlemens agreements, which the vast majority stick to.