Talk about missing the point. The FF's greatest incarnation was in its origins/early years, hence the reason it was once Marvel's best selling comic (during a period in the 60s, it outsold The Amazing Spider-Man), and that was when it was very much a product / animal of those times. That's who the characters were, and both the cold War and Mid-Century sci-fi/fantasy influences Lee & Kirby used to create a super team that was not one in the traditional sense. That Cold War period and the FF of that time were a perfect marriage, which is why that title/concept never reached the consistent heights of its 60s run again.
Every FF movie--no matter the producers, budget or screenwriters have set it in their then-present day, and failed miserably. That is not a series of coincidence, but the price of gutting the heart/defining characteristics from the concept, or graft them to a period where it essence is inapplicable. Again, that is no coincidence.
The FF do not need to be set in the present day, and again, films like Wonder Woman and Captain America - The Frist Avenger prove the point.