What's "necessary and sufficient" will be different for each person. But, if you don't have the knowledge necessary to translate your ideas to a sheet of paper, you're undermining your ability to create the art you envision. It's entirely possible to stumble into a photographic work of art, without any technical knowledge. However, understanding a bit of the technical possibilities/limitations will help bring your artistic goals to fruition, and on a consistent basis.
hi eddie
i have taught cyanotype workshops at public school art classes for a few years to grades 4-6
they had no technical knowledge about anything. they were given the prompt to put stuff on the paper so it wouldn't
fly away and to make interesting shapes / composition ...
no knowledge of how cyanotype paper works at all ..
after their paper changed color and was ready, i washed them and they dried ..
and some of the images made were some of the most beautiful photograms i have ever seen.
enough technical knowledge can be no knowledge at all.
i have mentioned my old roommate before .. his boss had no idea how to even use a camera
and her work is celebrated by some ..
sometimes the devil is in the details, we love ot know how things work so we can master them but we get bogged down
in the nitty gritty and the details end up mastering us seeing often times it becomes a rabbit hole, or its like peeling an onion
with no end in sight.
i have mastered enough that i don't need to worry about how to focus or what fstop to use or when to turn the lights on when i am developing film or prints ...
and until i run into more problems, i won't bother being bogged down by details ..
but that is the way i work, others work in a different vein .. and that's ok too