A different way to phrase it might be: The officers and the suspects disagree about what a reasonable suspicion might entail. Given the incentives, I don't think this is surprising.

I'll admit, my point in no way addresses yours -- how often are officers adhering the the specific legal standard?

I'm really not sure how often officers violate the standard; it wouldn't shock me if it were frequent

But when they do, courts will suppress the evidence, and anything that's obtained from knowledge gained in that search ("fruit of the poisoned tree").

I trust that mechanism. And think it's likely better held in the US than literally any other country (v open to evidence to the contrary though)

Not if the violation was done in “good faith”:

https://www.law.cornell.edu/wex/good_faith_exception_to_excl...