(especially when said dev demonstrates a key lack of understanding with respects......
If I tell you I added two numbers to get a result of 8, tell me how my "lack of cryptographic understanding" lets you determine which two it was ?
You're oversimplifying. Good cryptography requires formal proofs, not hand-waving and conjecture. You're clearly not a stupid person, so I won't insult your intelligence by reverting to
argumentum ad hominem, but then you should not insult my intelligence by deflecting and degrading the nature of cryptographic proofs.