Knots are still being invented nowadays. Or variants of existing knots.
Here are PACI's systematic studies on a few vital knots:
https://www.paci.com.au/knots.php
Here is a recent (2025) paper on the stability of the bowline:
https://www.epfl.ch/labs/flexlab/wp-content/uploads/2025/11/...
I was (badly) getting at the fact that back then, as a function of the totality of knowledge we had, discovering a new knot could be quite transformational – whereas now it's just one of many professional fields of modern research. Not implying it was then, or now, merely a hobby.
Tons of tree climbers are pretty experienced splicers as well. State of the art there continues to advance year after year.
1: https://www.planetary.org/articles/20120905-knots-on-mars
I'm not so sure about that. The history of the Zeppelin bend is incredibly contentious and apocryphal.
On the history, everything I know is from this excellent article, so might as well cite it here for the curious, and just in case you haven't seen it:
https://www.paci.com.au/downloads_public/knots/KnotBio_zeppe... (password: copyright)