I worked with Quad, 1” inch, some 3/4, Beta SP & Digital, and DVC Pro.
The RM440 I learned how to use in the television curriculum at a tech college. I edited quite a few projects.
The AVIDs were becoming mainstream about the time I escaped the public TV world.
AVIDs were for the elite producer/director class and a couple of dedicated editors. Never mind most of them knew next to nothing about computers of any kind.
I did and even carried a few certs all paid for by myself. A couple of times an editor job came open. I went through the kubuki theater of the process. The end result - someone from outside that knew very little got the job. Typically that person was a pal of someone higher.
Or brother or son-in-law or nephew or daughter. When I questioned the gentleman at the post house about how long they took to train these people he explained that he had paid his dues and others needed to do likewise.