“Nobody understands quantum mechanics”
Being able to solve quantum field equations says nothing about having an intuitive understanding of what they actually mean.
It’s very different from understanding Newton’s laws of motion. You can get an intuitive understanding of even the non-intuitive parts (even though when I was young, I thought rockets had to push against the atmosphere).
Bingo. Absolutely correct.
Our "intuition" evolved to solve real-world, macroscopic problems like "Will shaking this tree limb cause that fruit to fall down?", "Will we be able to take down this mastodon and harvest most of its flesh before the other predators come?", or "Is she smiling at me because she likes me, or because she has contempt for me?" - and is thus not suited to, e.g., describing the behavior of subatomic particles over mere femtoseconds of time.
Regards,