Not true. If you look at stuff like nsg, there are still some people going unmatched with great stats. A small number sure, but still a small amount.
And how many of those people with great stats go unmatched because they also have red flags? Or because they don't apply to enough programs, or because they only apply in one specific region? Certainly most. Once you remove these confounders and consider only those who have killer stats, no red flags (yes, that includes obvious personality disorders), also applied broadly... but STILL didn't match, I bet that number is extremely minuscule-to-nonexistent.
Second, applying to a backup is an acceptable course of events for some, but it can limit the number of programs that you apply to (e.g not applying to a gen surg program at the same program where you are applying to a plastics residency).
Then just apply to different schools for your backup specialty? Apply to bottom-tier programs in your backup as a safety. Or if your application is borderline just play it safe and make your backup specialty your primary specialty? Again, these are all choices you make. Nobody is forcing someone to apply solely to plastic surgery, they are voluntarily taking the risk of going all-in on plastics. It is a willful risk. You could go general surgery or primary care and have a virtual 100% chance of matching with the same stats. People feel entitled to certain specialties and are willing to risk going unmatched in order to pursue it. There's not necessarily a problem with that, it's a free choice to make if you think the risk is worth it, but don't complain about how the system is "unfair" because some IMGs matched family medicine while you went unmatched. You could have gone family medicine route also and had essentially a 100% chance of matching over those IMGs, but instead
chose to take the risk on a highly competitive field that you were only marginally competitive for.
Third, many people are not going unmatched because of the situation you described. Many are unmatched because of board failures and the need to stay in a certain geographic region.
Umm those are actually exactly the situations I have described. I said people aren't matching due to either serious red flags or poor recognition of their own lack of merit relative to what they are applying for. A board failure definitely counts as a serious red flag. And there is no such thing as a "need" to stay in certain geographic regions, there is a
choice to limit yourself only to certain geographic regions. If you want to stay in one particular area because you're scared to be too far from mommy or the in-laws or you are going to place your spouse's career demands above your own and absolutely refuse to do long distance for a couple years, then that is your choice. And if your application is not competitive enough to afford you to safely make that choice, then again this falls into the category of not recognizing your own lack of merits and results in an entirely avoidable risk of going unmatched.