Re: High Maintenance trait
I haven't played with that trait, but I've seen Sims YouTubers use it and it looks extremely annoying. My understanding is that they're in an almost constant state of emotional debuff unless you send them to the spa, etc.
I personally don't like really overbearing moodlets and debuffs. I've recently started playing with Lifestyles again (which was a shock to me!) after I gifted a friend Snowy Escape and she had fun with them, but I also downloaded Bienchen's overhaul to make them harder to get and to make the debuffs less overbearing. Shock--they're actually fun like that instead of annoying!
On the other hand, one piece of feedback that the Team has been getting is to make traits more meaningful, so... I don't know why High Maintenance feels different to me from, say, hot-headed or gloomy, but it really does. Perhaps it feels artificial?