A number of years ago back a sysadmin asked me:
Should I learn sed? Would it be useful?
I said no, sed is obsolete. "Learn Perl or Python instead."
But it was not always so.
When I was first offered a sysadmin job, they told me it was partly because I had sed on my resume
20-year-olds who knew sed were never common
And when Perl was fresh, it had to compete with sed
It was distributed with a s2p translator
And in place of sed -e 's/:.*//' you could perl -lpe 's/:.*//'