If you fail the bar and have a J.D. from Harvard you cannot work as a lawyer.
I can think of some very significant judges who failed the bar multiple times.
There are plenty of successful tier 4 grads and plenty of unsuccessful ones. There are plenty of successful Ivy League Grads and plenty of unsuccessful ones. Life is what you make of it. Certainly helps to go to Harvard, but the rules still apply.I don't know what "rules" you're talking about, but if we look a success as a percentage of the class judged upon income, then your statement is far from eye-opening.
Bottom line is that grads from T3/4 have VERY VERY little shot at making nearly as good a living as those from T14. While I transferred from a T3 and and will make 160K (and I put NO EFFORT into searching for jobs outside of OCI), my friends that remained at the T3 are all unemployed -- except a few outliers who garnered 40K/year jobs.
Rankings matter, and law schools, at all levels, are scams. However, T20/T3/T4 will never produce an abundance of BIGLAW/mid-law lawyers.