This is probably overstated—at most major US research universities, tenure outcomes are fairly predictable, and tenure is granted in 80-95% of cases. This obviously depends on your field and your sense of your fit with a potential tenure-track job, though.
That said, it is much easier to do research when you’re at an institution that is widely considered to be competitive/credible in your field and subfield, and the set of institutions that gets that distinction can be smaller than the (US) top 100 in many cases. So, it may often make sense to go for a postdoc if you think it’ll increase your odds of getting a job at a top-10 or top-50 institution.
This is probably overstated—at most major US research universities, tenure outcomes are fairly predictable, and tenure is granted in 80-95% of cases. This obviously depends on your field and your sense of your fit with a potential tenure-track job, though.
https://dynamicecology.wordpress.com/2014/07/21/dont-worry-too-much-about-whether-youll-get-tenure-because-you-probably-will/
That said, it is much easier to do research when you’re at an institution that is widely considered to be competitive/credible in your field and subfield, and the set of institutions that gets that distinction can be smaller than the (US) top 100 in many cases. So, it may often make sense to go for a postdoc if you think it’ll increase your odds of getting a job at a top-10 or top-50 institution.