In the late 70s PCs did not exist. Using a mouse is not a substitute for learning to type efficiently. Learning one application from top to bottom can take more time than one has.
Computer systems are still relatively stupid in spite of all the advances.
Older systems that remain functional are not easily put aside in favor of newer versions. In the last year or so, processor speeds, hard disk sizes, and RAM supplied with new systems have all dramatically increased. Using tried and true things is always more comfortable. Change almost always produces some anxiety. New introductions such as Win'95 create a mix of hype and anxiety and more experienced users wait for the dust to settle before moving on the latest.