You can put down you’re decent at Java or C++ or Python and actually be not that great at it because you have nothing to measure against. But in chess there is a rating system. So you ought to know if you are truly remarkable or not. If you think you are remarkable enough to put it down and then suck at it, how ignorant must you be?! And more importantly, that ignorance is not at all tempered by humility.
I have a single line on my resume with interests. I don’t list chess, but list cryptography. Because I’m interested in it.
I just have that line to help with chitchat during the interview. If some interviewer interpreted that to mean I was a professional cryptographer and that I sucked at it, that would be dumb of them.
I also list an interest in kayaking, even though I suck at it.
I list kayaking as a hobby not because I’m competitive and awesome but because I think it’s fun to float down a river. I suppose if a company expected me to be good at my hobby and judged me because of it, I wouldn’t want to work with them because their culture probably has other stupid parts to it too.
If you were great as chess for a human, you probably wouldn't be applying for a securities job.
Conversely, there was a period of my life where people would hear me talk through a few problems and later confess their surprise/disappointment upon finding out I'm rubbish at chess. I found more lucrative and/or entertaining puzzles to plow my ample free time into, is all.
If you want to play 800-level chess, you can have fun without knowing any set openings. Well, almost. You'd better be able to recognize and defend scholar's mate at a bare minimum.
But that is a bit like being an amateur programmer who never learns what a function is. You can still enjoy programming at that level, but it's odd to describe functions as crutches.
Besides, once you get into the middlegame, you still need the tactical and positional skills that I suspect you consider opening knowledge a crutch for
In chess (and life) it’s far easier to pattern match a solution for a position rather than coming up with a brand new solution every time
In my opinion, this makes memory and experience far more important than intellect in chess, especially in the faster time formats
Without opening theory you will just get worse middle game against any competent opponent. Furthermore, if you could just calculate everything ab inito your play would be identical to “memorized opening,” alpha zero did learn a lot of standard openings from self-play (without being shown these opening explicitly). If someone plays a “bad” opening in a serious game it’s because not only they don’t know theory but they also can’t calculate well enough.
I would not expect someone who puts chess on a resume to play competitively, which is a whole different beast.