Till you are kind enough to provide us some stronger evidence about the question posed, we pass your unsympathetic rhetoric.
I am getting tired of this thread, frankly.
Most people here seem to be of the opinion that knots are tools (mostly so) as well as structures worth studying.
Yet you keep insisting that practical knot tying (using knots as tools) is a thing of the past and you dismiss any "evidence" posted as irrelevant or not holding up under closer inspection.
As most posters here give you that much that, repeating the above, knots are also structures worth studying, you don't give an inch.
Ask a professional fisherman if he uses knots, mountain climbers, firemen, arborists, farmers, surgeons. I tie my shoes with a knot. I use the constrictor as a tool in fancy knotting, people put a knot in their ties, knots are used for fishing. And even if, as you claim above, some people don't tie their own fishing knots as they buy them readily tied in the shop, who tied them? Somebody tied them and that does not contradict by any means that they are used as a tool.
Even though the old fashioned sailing ships (such as the "Bounty") have mostly been replaced by motorized version in the navy and industry etc. they have not vanished at all on the oceans. The German navy uses one to train their officers and there is a lot of knot tying going on on that ship. Smaller, more modern versions are used for sports. Regattas take place every weekend somewhere and all those ships require knots being used as tools.
Have a look at any harbour and you find lots of little sailing yachts and boats. Believe it or knot, the owners use knots when they sail them and tie them to a cleat. And even the big commercial motor ships have mooring ropes with a knot at the end.
I consider this as overwhelming evidence that knots are used mostly as tools.
But you will probably look at these examples closely again and find that the knots in these examples are knot really used as tools, right?
nuff said, over to you (as you are going to have the last word anyway)