Dine Out - Do I need to elaborate... Everything is sadly broken, how can they even leave the whole thing in that state I wonder.
Get To Work - It's really petty but i'd like to be able to choose the shop-type, between "tablet checkout" and "cash register checkout". The latter is much more immersive I can't even explain how and why but that's just how I feel.
City Living - Being able to build appartments in any world really. But with the way those are made in the game I get why that would be difficult. Also, improving the elevator animation, as in our sim coming inside and out of the elevator. The teleporting breaks the immersion somehow.
Get Famous - reworking, or adding a new tier, to the existing skill trees. I don't find any of the branches interesting. I also liked being harassed by paparazzis and hardcore fans in Sims 1 and I feel like the ones in Sims 4 are too nice lol.
Across all worlds: Being able to hike, a nice feature that is going to be introduced in Snowy Escape. Could benefit from new animations too, like taking pictures of the SCENERY, and not necessarily selfies.
Eco Lifestyle: make NAP interesting, or let you choose which ones you want to add to the NAP pool. HOW did the devs think that some of the NAP they introduced were even remotely FUN? NO, I don't like sims stealing random things from my lot with me noticing 2 hours later, NO, I don't like seeing random sims doing push ups at the restaurant.
Some of them are interesting and are a real nice challenge tho, like the ones where you have to produce enough water/electricity with eco-machines or else you get a fine. But oh god are most of the other ones uninteresting, and the whole eco footprint is broken since you can't, even when trying really hard, get a bad eco footprint. Make some of the actions and the materials you use have more impact and not necessarily tend toward a neutral footprint. The whole EP is pointless as it is today, but yet had a lot of potential.
Realm of Magic: It's not really reworking, it's more like asking for new content so I'm not getting my hopes up but... Make some spells' effects exclusive to RoM? All of this GP spells borrow something already existing somewhere else in the game. No effect is actually new. It's kind of lazy.
I wish they let the children play with magic too, like in Sims 1, with the tool that looked like a lizard.
Magictown was fun too, with missions like chasing clouds, and exchanging materials for Magic Coins and various benefits.
Overall RoM was a missed opportunity I guess, it took "magic" too seriously.