Exactly. It comes down to your design goals. If your intention is to make computer systems that can peel back the mask and read what everyone’s internal thoughts are, en masse, then you’re going to have a bad time. If your goal is to make computers less emotional dunces, capable of recognizing when people are angry or uncomfortable and behave tactfully around that, then you’re in a solvable problem.
Trust me, if the problem is that Bulgarians have a different set of physical body language, the software can be localized. The real question is whether we’re designing for communication and transparency or for control.