Years ago, companies issued Route Data Cards to the pilots. A lot of pilots liked them because they were easy to use. It was determined that RDCs often contained errors: wrong frequencies, DME steps, CTA boundaries, etc, etc..
So it was recognised by the industry in the early '90s (in Australia it was the '90s... the rest of the world were already ahead of us and got rid of RDCs years before), that RDCs were
actually a really bad idea! RDCs were seen for what they are- a source of
Threats and Errors. As a result, RDCs were abandoned, or
managed out of use.
Except for at Skywest, who were using them well into the 21st centuary and might still be using them. Remember the F100 that flew 2000' into CTA without a clearance because the lower limit of Class A was wrong on the RDC?
