No doubt you make some valid points Andrew.
It's valuable, though, that people point out these small deficiencies for the benefit of others who have yet to discover these little "failings".
I've lost count how many times I've been slightly off in my calculations and what I've been trying to do because my gear isn't quite accurate.
It's also easily fixed, of course. It's just good to be able to let others know of potential pitfalls and what to be on the lookout for
