That just doesn't make sense. If you are one of the 6.3% US MD graduates that didn't match in 2021 (which has been the same every single y ear, historically 6% of US MD don't match), then chances are very very high that it was due to an issue that was within your control and not the fault of the 'system'.
1.
Even if someone fails to match due to circumstances completely under their control, are they not allowed to complain or vent their frustrations? If a Neurosurgery resident complains about being sleep-deprived, is the best response really something along the lines of "suck it up, snowflake, you knew what you got yourself into"?
2.
Putting aside the issue of students complaining or being "snowflakes", you bring up the role of the "system", which I think is actually a really interesting line of thinking (which you just sort of ignored):
Saying that 6% of people didn't match and that number has been stable for a while doesn't really address the health of the system. Let's put aside the people who apply poorly (e.g., someone who has really low step scores but shoots for Derm), because eventually those people likely make it into a residency program better suited to their competitiveness.
Is it reasonable to expect that someone who graduates from a US medical school should be capable of practicing medicine competently? I would say yes. If schools are graduating people who they know are incapable of practicing medicine, then that would definitely qualify as a system problem.
Is it reasonable to expect that someone deemed capable of practicing medicine should have the opportunity to become licensed and then practice medicine? I would also say yes. Obviously you will never have a perfect 1:1 ratio of capable graduates to residency spots, but from a societal standpoint, it would be ideal to get this as close to even as possible. Is 94% as close as possible as we can get it? Maybe; I don't know, it does seem like it could be a bit higher.
In any case, someone saying that a 6% unmatched rate is a system problem seems not unreasonable to me. We could 1) be graduating students who should not be graduating, 2) be matriculating too many students, 3) not have enough residency spots, or 4) any combination of the above.
Before I get straw-manned again, my personal feeling is that IF we are to consider this a systems issue, then it is due to a combination of 1 and 2, NOT 3.