liking sincere people

I realised again how much I appreciate sincere people. Ok, admittedly sincerity might be a bit rough to take at first, but I am by now convinced that it saves you a lot of trouble down the line (basically the same thing as the short feedback cycles in agile programming... quite a human and common sense thing, really).
It's like filling things in a black box, not knowing if they go together well with what is already in.. but how should you possibly know if the owner doesn't tell? You will usually only notice when suddenly and out of the lightest blue there comes an explosion for some completely minuscule thing. And as is probably intuitive, an explosion tends to cause much more damage than some bit of incompatibility information given at the start.
For this reason, it take it to be quite useful to address people directly when a problem occurs, because most of the time they are not deliberately being a nuisance. I just wonder if generally people need more encouragement to dare to state that they do not like something.