why are brainlets seemingly so incapable of making rough approximations

Well it depends.

>>9164000
Every brainlet is different.

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56KB, 645x773px

What, me generalize?

This is something I've noticed about left-leaning folks, they are utterly incapable of thinking in terms of probability distributions, averages and expected values. Instead they can only consider concrete, individual cases.

>>9164000
You ask those questions for a reason, and your answer may be more or less useful depending on the context in which the question is asked.
To use your example of a daily commute, here are 2 examples where different answers may be more appropriate. Assume a daily commute that varies by aprox. 1 hour but is the same every week.
>You ask because you want to know how long they waste in transit on a weekly basis, in which case a mean would be appropriate but a total number of hours would be more useful.
>You ask because you want to know approximately how long it will take them to do a task on a certain day or what time they would be able to do a task on a certain day in which case the transit length for that particular day would be more useful than a mean.