I love this game, and it gets better with each new expansion pack, game pack, or stuff pack. When Sims 4 began, it lacked a lot, so I have to say, it's come a long way. Despite all the game improvements and new ideas implemented, though, there is one area where the game really needs a bit of work, IMHO. That's "family relationships."
Earlier in my game, a sim's son called her and invited her over. That was nice, but when she got there, she had to introduce herself to each of her three grandchildren. Seriously? This is nothing new. It has always irritated me. Surely this game can do better at noting family relationships, even the extended variety. Grandparents should not have to introduce themselves to their grandkids. In-laws should not have to introduce themselves to their grown children's spouses, other than one time. Cousins should know that they are related.
On a similar note, when sims get married and plan a wedding event, they should be able to invite guests from both the bride's side and the groom's side. I also think it should be possible to "invite a household" over with a simple phone call. When a new baby arrives, it would be fun to have the grandparents come to see the new arrival, but as often as not, the new mother can't call her husband's mother because they haven't been introduced and/or they aren't friends.
As much as I love this game (I've played since the early days of The Sims) I do get frustrated by something that seems so simple, so logical, and so necessary.