I miss an option to upgrade beds, so that they give more energy. I like some of the looks of the cheaper beds a lot but they are literally torturing the Sims who own them. I finally modded that myself (https://www.deichschafblog.de/s4/sonstige-mods/), but I would still appreciate EA taking care of that.
I like the upgrades self lighting fireplace and bidet to the toilet a lot. I also like the upgrade for the stereo that gives the Retro channel.
Every time I update the tea pot, I regret it, because afterwards it always gets buggy and needs to be replaced because the foul tea can no longer be removed. Also until some patches ago, the upgraded tea pot used to just vanisch from the game completely (which is luckily fixed by now).
I think the upgraded items break significantly less, but they still break quite a bit as the original breaking chance is too high without mods.