>"How often” as used in colloquial English is not measurable

So what "observe how often" means then in your colloquial English?

I legitimately asked about stats. On this forum I presume you know what it is, how it's different from anecdotes. And it makes your behavior look not particularly honest.

You could have sincerely answer: "I have no data, but I have a gut geeling/impression" - that would spare you from wiggling around, and claiming that English is not to express facts.