plotlines/character traits Elementary kept consistent during the 7 season and did better than most other tv shows
Joan and Sherlock are not romantic partners, but they are platonic soulmates
Joan and Sherlock, while capable of being and working on their own just as well, are better and stronger together than apart
Joan Watson don't need no man to make her whole
Sherlock is an addict who is constantly struggling with his sobriety
Marcus and Captain Gregson are inner circle and family
Jamie Moriarty is smart and intelligent, and in no way less than any of her opponents or other Moriarty-versions because of her gender
Sherlock is not super smart "just because", but he constantly learns and educates himself, and is willing to admit if something is not his area of expertise and ask for help
Joan can easily kick ass in several different ways, and still maintains typically feminine traits (gentleness, kindness, being a mother, wearing high heels, etc)
Sherlock and Captain Gregson's father-son-like relationship and trust (despite the initial rocky start)
Joan and Marcus's dynamics. close friends and good teammates when working together, without any romantic undertones.
in fact, the only romantic relationships in the main cast were between Sherlock and Jamie, and Joan and Mycroft.
there might be more but that's all i have right now