You are being downvoted because your reply is basically an unnecessarily long "nuh-uh!" - a dismissal without any counterargument. Wrapping that in a string of fancy words does not change the fact that you are not providing any argument at all.
As far as I can tell, the previous commenter was in agreement with the sentence he quoted, going so far as to say that the “on a dime” stipulation isn’t even necessary to consider the idea that we “must always be prepared for it to do something unexpected” an absurd reality
Hm, after reading and re-reading the post half a dozen times, I realized it can indeed be interpreted that way. Now I'm confused. :)
I agree with the sentence quoted, and wanted to amplify it by noting that when something unexpected happens, even if it happens rather slowly, it can be impossible to deal with it. Because when you see that your assumptions were at least partially wrong, you likely start to question all, or most, of your assumptions about everything. Which can paralyze you for an extended amount of time or lead to just thrashing around.
Yup, looks like I misunderstood your use of "this" at the beginning - I thought you were referring to the post you were replying to. My bad.