[LD] Excessive autonomous 'Speak dead language'/Relationship deteriorating

I am going to have to agree with this. I am playing a family where the mom runs a funeral home, daughter is a reaper and dad is a ghost and is a patron of the arts. I had mother and daughter max thanatology because of a wall message I read that said something like her pronunciation wasn't what it could be. I think that even though it is maxxed out, they need to speak it to get better at pronunciation. This seems to have helped somewhat and they will get positive interactions MOST times when speaking it at each other. However, it still happens plenty enough that the interaction will fail I guess and the interaction will have a negative impact on the relationship. And it was more so between wife and husband to the point of festering grudges and hurt sentiments. It was so detrimental I had to put them in relationship counseling and dates to fix it. 

So when it is said "functioning by design", WHAT purpose is this supposed to serve? Usually something is designed to have a purpose. I mean I have to watch my sims closely at home to make sure this doesn't wreck their otherwise perfect relationships and I cannot take them out into public unless I absolutely have to. So if the by design is to make these sims anti-fun and non-socializable, then you're rocking it I guess.

I agree, I’m having to constantly repair my sims relationships with each other and it’s ruining my experience with the game.