I know Thor was dealing with the Dark Elves and with Banner and loki in Ragnarok, but I wish we got more time with him and Natasha because she's only one on the OG 6 you never got any sceen time together as friends and co-workers maybe chat about how different upbringings, having different siblings relationships, and maybe form a silent bond with team ups and maybe he show her asgard, pre Ragnarok and maybe talk about the difference with Godhood and humanity. Also, ScarJo and Hemsworth would have great chemistry together even without the other Avengers members. It's opportunity in the infinty saga that i would love to see explore.
I wish we got more with Thor and Balck Widow because it's ashamed they never got a lot of screen time together in between their Avengers work.