tweaked; don't fix it sorry, all helpers in our game need re-programming they can not tweak a Butler to work if all he does is sit and read, yes tweaked can make him read faster or slower, but it will not fix the problem.
I made my own nanny's with the best traits, I do believe it is the position or job as well. Because they still return when we return home. They did start off a little better I mean my nannies, but they all change back to their programming. It's just in the game to be that way. I do not have any Toddlers at the moment. When I do I just let one parent stay home until they are school age.
Why are they programmed to never feed the pets, Why can't they fill a pet's bowl because they want to annoy, They are not real they are programmed to NOT do anything it's in their programming. Traits will not help very much, Why because it's in the Job what they do, They are not normal sims unless they leave the position.
I think nannies are good for dog pooping they do that job well, and the Butlers are not bad at it. So I do keep them around for that. But these simmers and myself are telling the truth about the helpers in these games. They are programmed to get on our nerves by not helping, and that's why the butler has that book. lol. He reads, makes a drink, wipes his white glove to see if my counter is dirty and its a lot of dirty dishes around. perhaps they are programmed not to see them?
I had a nanny that left my toddlers, I return home no nanny in the house, toddlers starving, dirty and sleepy all reds. now pop up time we will remove the child from neglect :/ after I quickly feed them both who comes across the yard the nanny speaking only a hi to me and then watched tv never looking at the toddlers. That's not a trait problem, it's programming.
Also, we can not change traits. I use to think the same as you, then I found the problems are in the programming for the jobs.
Listening to the players of the game is the best way to know whats going on. covering over it will not help us. We are not putting anyone down we are just speaking the truth. We pay for help and get little or none.