Them : I have this problem, do this thing to fix.
Me: but this thing will not fix. I suggest that thing instead.
Them: Please do this thing.
Me: but this thing will not fix. See that thing that will fix!! (begins to work on fix)
Them: I don't understand why doing this thing is a problem!!!
Me: it's not a problem. I will do it, I promise*. But it's not a fix for that problem. I have made a fix for that problem. I thought you'd prefer me to explain why doing the thing would not help in this situation.
Am currently gloomily awaiting grumpy response saying : DO THIS THING!!!!!!!!!!
*though not quickly because the thing is in this case, a PITA and will have zero impact on anything, being designed for a whole other scenario that simply does not apply here.