There's so many things to love about Sims 4!
I love the micro expressions that the team has programmed in most of all. The idle animations for pregnant sims are so sweet and protective they melt my heart. That's just one of many. The person/people who thought of all those tiny details is a genius and MUST study real people often.
I love the tongue-in-cheek sense of humor that colors everything in the game/franchise from day one. The bear suits for children. I chuckle every time I see one of my kids dawn the bear suits. They're so cute and frustrating! The teen angst walk makes me laugh so hard. I know it takes them forever to go anywhere or do anything with it but isn't that how slow we all do things when we're feeling angsty about things? We don't want to do it so we take our time and act out when we are kiddos.
Multitasking! I know this is old hat by now and everyone's like, "Been there done that" but its wonderful. Each time my sim takes his dinner plate to the toilet I laugh and cringe! I love that I can spam socials while my sims do homework, work from home, eat dinner, workouts.... so many things.
Build/buy. There are things I hope for to be added someday, but it is by far, the best build/buy we have ever had for any sims game in my opinion. I LOVE that I can pick up entire rooms and move them, shape and reshape, and mold them to fit my whims. I still want the ability to create split level homes. The platforms are nice but not as helpful as I'd hoped for split leveling. I can't wait to see what new things the team(s) bring to build/buy in the future!
Unpopular opinion but: the lack of color wheel/spectral layer They were wonderful, but I find it so relaxing and so much easier to create my own sims fashion looks without needing to know all the technical steps to editing spectral layers. I love the ability to fashion things the way I want them.