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That's not cool. That's basic storytelling 101. I think the general idea is that you write the best story you can, irregardless of what has come before. Who gives a shit about minor continuity like this? Like honestly. Things change in comics constantly, getting hung up over petty details like how time travel should actually change things is silly.
The reason Age of Ultron is crap is because it's cliched, slow and hasn't done a good job of portraying any sense of gravitas to the current situation. Not because it messes with how Hawkeye was portrayed 30 years ago or what it means in contrast to other time travel stories.
The best stories in Marvel's history have paid fast and loose with what has come before. Look at how Bucky has been used in the 60's and now. Look at Clareont's X-men run. Just let it go Amobeas!
NOT A WORD.