Y’all are missing a serious angst possibility…
How many times has Natasha been severely injured on missions with the other Avengers? She doesn’t have any superpowers (mild enhancements, maybe, but that’s not enough), so she probably gets injured a lot compared to the other Avengers, and takes longer to heal/injuries are more serious for her. I imagine she gets hurt even more than Clint, because he primarily uses a ranged weapon, so he’s not as up in the action as she is. She does use her guns, but it’s usually at close range and paired with hand to hand combat.
How many times has she been shot or stabbed, and bleeding out while the rest of the team tries to finish the fight and get her to safety?
What if they didn’t see her get hit, and they find her afterwards, barely conscious in a pool of blood?
How many times has she stood and fought on a broken ankle?
How many times has she coughed up blood and continued fighting anyway?
How many times has she taken bullets for Steve or Thor, even though they have a better shot of surviving getting shot than she does?
How many times have they all gathered around her in the Quinjet on the way back because they genuinely thought it would be the last time they see her?
And then what about the missions she can’t go on because she’s recovering, and she’s sitting around feeling like a complete failure, terrified her friends won’t come back and it will be her fault?