That is just your own cognitive bias talking. In reality we see the McVays, Belichicks, Shanahans all having a lot of success despite getting their feet into the door as kids of connected parents. Do all of them have success ? No, but it is a far cry from "most likely".
We are talking about football specifically and not some dynasties of dictators in North Korea or politicans in the US. And unlike politics or many other fields the reality in sports is that the closer to the field you get the more blatant nepotism tends to clean itself up. None of the low level positions come with status in monetary or any other terms.
You are just belittling and denigrating the work and effort of people just because of their last name.
Nope. I'm noting the likelihood that Kyle Shanahan would be, without the family tie, judged most deserving of the "shot," to be vanishingly small. It's still a very old school "workplace" though, so I don't think the nepotism will be questioned any time soon. And let's face it, we'll give the benefit of the doubt to BB's offspring. In fact, I've seen here (and rooted for) the opinion that little Belichicks will succeed the Big Belichick, and that (much less important to fans,) little Krafts will succeed the Big Kraft. We tend to think you get the father when the son is on staff.
If I teach my kid finance, s/he might therefore be the best in the field by my lights. If he didn't produce the best returns in the biz as a fund manager, we would go into this whole thing about how he outperformed given this that and the other constraint emphasized ex post facto.
If the pres were questioned closely about that kushner kid's chops, I am positive the boss would launch into an invective against every other possible "pro" for that position, whatever TF the position is.
And we can write the narrative any way we all want about BB's kids, or the shanahan kid, or whoever. The fact remains that, while you might get by with what you can share with your kid, and the kid might be a football savant in a coach's house growing up, etc., somebody else somewhere without a shot is probably yet better at it.
I loved lauding Bledsoe as a coach's son back in the day and talking all about how great he must therefore see the field. I remember the bloodline QB at Michigan, Brian Griese, playing against TFB, and Madden or someone saying "Gee, I don't know if he's even the best Michigan QB on the field right now." As if it should be a shock that the guy who's good at something despite not having the assumptions stacked up in his favor, would nevertheless be good at it.
BB's kids are pretty much unknowns to me. I just don't think it likely that they're the absolutely best possible picks. I do know as well that BB is a big fan of treating others in the "coaching fraternity" right, because it's so small, and you'll see those folks again... another, and I think good, old school attitude.