I feel like a few have touched it already, but going into it.
What writers should take away from WW is heroism. WW is basically taking from Spiderman and Superman, but it is something forgotten in many of the modern comic book movies. This isn't just as simple as a quip ruining or moment. It's the entire process of the film, followed by the lead up to the act or acts.
No Man's Land for WW was that. She leaves the Island with Steve to save people, the entire time in London is her wanting to save people, but being told she can't now. Then she is then put into the position where she can either go along with Steve's plan to end the war or do what she came here for. And the reveal is pitch perfect. Her removing the non-uniform articles of clothing, slowly stepping out fearless into what no one else there can handle, and charging forward, This isn't the end, because of that act, the rest follow forward. She takes on the entire German line and acts as the shield for the rest, inspiring people who couldn't not move, to suddenly move forward.
This is that heroism that is missing in many current comic films. The sort that is cheesy, but inspiring. The setpiece is designed around her will to help people being the driving force. Her getting pinned down by the entire line, but the rest following to give her just enough support to break through.
Compare it to Avengers for example. Yes, they are saving people, but it's second to Loki. Or the action pieces of Hawkeye shooting, Hulk smashing, Ironman flying, etc. It's never once been the center of a set piece since, what Capt 1 which turned out to be the highlight of the film for many. A pure build up and moment to it. It's why I still think Capt 1 has the most emotional punch still out of all the Marvel films. GOTG2 comes damn close, but I will also note GOTG2 is unique in a sense that it is clearly a comedy masquerading as a Superhero flick ala Deadpool. Rather than trying to being like Capt or WW.
Think about the most memorable scene from Superman(OG) or Spiderman, they're similar. The train sequence is it for Spiderman 2 which climaxes with him sacrificing his body to stop the train. Followed by the people protecting both his identity and him. It didn't matter that Doc Oct cracked a joke and ended it. What matter was the lead up to it. He's back, the one that inspires the city is back.
WW fucking nailed this aspect. It's has that Hope to it. You're not cheering for her kicking ass at the moment in the NML scene, you cheering for her, because she is showing that the impenetrable wall in front can be broken. Her will do what is right won't be hampered anymore.
This is also what is so painful about MoS. Imagine if the finale fight was changed just a bit. Rather than Super and Zod just duking it out. It had bits where Supers would take some shots from people, save some people from Zod's wraith along the way. Rather than throwing a goddamn truck, he takes the hit and shields people from the blast. Basically, Superman acting like Superman. Exactly what the trailer said, "They will stumble, they will fall, but they will one day come with you into the light". People are then looking towards him to stop the menance, believing that their hero will save them. This is why people are so frustrated with Synder's portrayal, since every thing Superman has done has been empty for the character that is the living embodiment of being a Hero. He sacrifices himself because he knows he can for others. Not just Lois, but anyone.