Nostalgia may not apply to you personally, but it does to many FF writers and readers. Also as another poster said, the Future Foundation was the natural evolution of the team that solved that problem. But sadly, it was stupidly erased due to nostalgia and "returning the status quo". It was the dumbest thing to do.
But that is just one problem with the FF. Another is the over focus on Reed to the detriment of the other characters and him being the one to always solve the problem to save the day. The lack of development of Sue and Johnny, and reusing the same plots over and over again. No one on such a small team should be as underdeveloped as Sue and Johnny Storm.
All of these factors play into the team seeming dated because it's not changed since the 60s. You may get a run or story arc that differs, but it never lasts.