I often enjoy listening the Brian Kernighan reminisce and foretell.
Witness
Coffee with Brian Kernighan - Computerphile
https://youtu.be/GNyQxXw_oMQ
This 28 minute conversation between Professor Brailsford and Brian Kernighan
begins with stories about awk(1). Eventually they start to talk about
text processing and the question of how the next AWK book will be written.
Naturally troff(1) and groff(1) come up.
That part of the conversation starts here:
https://youtu.be/GNyQxXw_oMQ?t=1312
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Mike Bianchi