By that reasoning, isn't Reed 'incompetent' for the cosmic accident in the first place? Reed isn't perfect. He makes mistakes. And when he makes those mistakes, it's typically from pushing too hard to go beyond anything anybody else has ever done.
And by the way, 50 years could be 5 minutes FF time if they're traveling close to the speed of light. 
Definitely. It might be that Reed brings his team home immediately, and there is never a prolonged period where they are trying to get home. Not even 7 years like Star Trek: Voyager, but more like an instant.
In fact, this could potentially occur during the cosmic storm. They could start out as adventurers in the 60s, but when they gain their powers, they not only are caught in a storm of cosmic rays but also go through a time portal that brings them to the 21st century.
Now maybe afterwards, it's not that they can't get home, especially if they have access to a time machine, but that they choose not to go home because going home would create some kind of temporal paradox which would undo too much of certain aspects of world history. Or they remain in the present to fight an enemy, knowing they have more access to modern technology than back in the 60s.
That seems forced because why mention him now & never before in any other movie ? Obviously we know why but in universe it makes no sense to suddenly mention someone that might have been as smart as Stark
MODERN DAY IT IS
You guys can't just spin this 60s thing it does not work why would the MCU suddenly up until now act like people Reed Richards never existed in universe & thus that creates a problem there is no good in universe reasoning for this
It is just much easier having Reed Richards be a young & upcoming scientists in modern day maybe mid / late(ish) 20s but might get away with max mid 30s as a scientist finally coming into his own cracking alien tech & can also solve problems that Tony can't allowing him to earn Tonys respect quickly etc
They are gonna have to change a thing or two here regardless of what era they put them in but having Reed be an up & coming scientist thats smarter than Stark & Banner makes much more sense
As I mentioned in an earlier post, it could be that since the inception of the MCU, and in all the films we've watched, people haven't known of Reed Richards and his team as a team of superheroes, because they weren't superheroes yet. But if there is some kind of temporal paradox caused by someone like Doom or Kang, then history could be altered where, from this point forward, people do acknowledge their presence.
Well....I think that depends on how this "accident" is portrayed in the MCU. Could it been entirely on Reed? Could it been sabotaged? Who knows
Im not asking for a perfect Reed. If Reed and the team are an established group of superheroes in the MCU 60's and were in the public eye of NYC and the world which they should have been there would have been many well known documented adventures of saving the city and the world from external threats be it cosmic or man made. Thats what make them known as "The Fantastic Four" the Worlds First Group of super heroes. People thought Thor were nothing but stories till he arrived and made his presence known.
They don't operate in secrecy. So what "fantastic" things were they doing to make themselves of legend to the people of earth? There doesn't seem to be any existence of this at all in the MCU. Its seems forced to go back and say they were there. You guys are proposing a whole film devoted to them in the 60's.
And if Reed Susan Ben and Johnny have been missing for 50 years our time then you are taking away a big chunk of their history on earth. Their impact on the MCU. What made these characters "fantastic". You have effectively made them Captain America on ice for 70 years. They return to present day and they are behind the times. Too much exposition. Maybe Im missing something here? I just don't see how this works.
If you watch shows like Timeless (or really any other time travel show), prior to the time that the crew go on a mission, everyone knows history in a particular form, which we could represent by the letter A. But when they return and history has been inadvertently altered, everyone instead knows history in a different form, which could be represented by the letter B.
So, for example, in one of the Timeless episodes, the time team went back and accidentally met Ian Fleming, the writer of the Bond novels. After their adventure with him, when they returned, others talked about an additional Sean Connery James Bond film which the time team never knew about. But the others spoke of this film as if it were common knowledge and that it had always existed. History now didn't know any differently.
Or in one of the final episodes of Quantum Leap, when Sam Beckett leaped first into the body of Lee Harvey Oswald, and then into the body of an agent protecting the Kennedy Presidential detail, they made it out that in the original version of events both John F Kennedy and Jackie Kennedy were killed. But now, because of Sam Beckett's intervention, Jackie Kennedy has survived, and that's the version of events history now remembers as having always occurred that way.
