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I found this image after some searching, if this far enough....
Anyway retcons do suck sometimes and for the final part of this I'm going to retcon this thread into a prequel for my thread tomorrow on sins past. The 15th anniversary celebration that Marvel would not dare to give it but I will!
One Hal fanboys get there hero back, DC gets a new Villain who can be a plot point, and you make Sinestro a really powerful force in universe it's a retcon that I would also says add more then take away. That is a key thing.
Anyway these are bad retcons, what are good retcons. Often times they are retcons to fix something and it sometimes more simple. Take the Parallax retcon. Some people hate some people love it. But it does fix things in a clean way.
Example the Rogues were given powers in the Nu 52 but Geoff liked writing them as smart guys who have to work for their powers so he took out Captain Colds power when he got to write them again.
Yeah that was the thing he did actually before then it was just not a thing. Anyway, that's why the speed force retcon exists to explain why the DC universe at the time had so many speedsters in it's history. A way to connect them and also simplify somethings.
The Flash mythos became about Barry Allen but the problem with Barry is that he was not the MC for 20 years and the most important Flash actually happened in the 90's for better or worse.
Peter's parent are a good example, keep in mind the comic didn't mention them for years, so it was kind of odd that Peter never seemed to talked about him. The spy stuff was added more at a shame spot to point out why Ben and May just never really talked about them.
the main driving force and core story is him learning to understand his father. Because this is important if your character has wants and needs besides the plot and chooses to step up it helps to take the sting out of it. Motivation for any character is key.
Warren Ellis characters while "flawed" are good examples of how much of a thin line this is. When he brings in these characters they warp the narrative around them to call how the old ways are shit and then they prove how awesome they are.