Heads up, this video will contain spoilers if you're not up to date with all of the episodes of The Falcon and The Winter Soldier that are currently available on Disney+.
Okay, if you're not afraid of spoilers, this Marvel fan/Youtuber points out several things that lead him to believe The Falcon and The Winter Soldier was originally supposed to contain a subplot about a worldwide virus outbreak, that they obviously did not want to continue with after the entire world was affected by a pandemic in real life over the past year. Some of the evidence he shows is that one episode contains stolen vaccines that are never explained, and a lot of the dialogue that explains the current plot is delivered by actors who are off screen. That is significant because he believes it was easier for them to change previously recorded dialogue by recording the new lines in a recording booth and dubbing them over footage that was previously filmed. If that doesn't make sense, it will when you watch the video. He also sites stories that came out about the delayed shooting schedule of the show, and shooting locations.
As a huge fan of Marvel, this show, and watching movies and tv shows in general, I feel so oblivious for not catching on to these things, but now I think he has a point! Check it out and see what you think!