If the question is should you learn the old stuff just because that's what more senior workers had to use, no there is no reason to walk 10 miles uphill in the snow both ways just because someone else had to.

On the other hand there is every reason to use the best technique available which in some cases like shell scripting is an old old style.  So from that perspective don't pass on learning something just because it happens to be old or doesn't appear to be new and fancy.  Don't go pick up a javascript book from 15 years ago to learn web design but do learn how to use the command line, learn how to do things directly in SQL without a GUI etc..  🙂