I agree with this as well. Franklin forgets about his powers or they get dampened when a new writer comes along. It's the same as Johnny reverting back to a prankster after being serious with previous writer. It's the same as how new X-Men writers show that someone has to tell/teach Iceman that he can be more creative with his powers (I would not be surprised if present-day Iceman learns how to do something from his younger self). I think Fantastic Four would have been better if Reed had said that they were going on a family vacation. No need for a "search for the cure" storyline. The FF team could have been there as replacements without the "for only 4 minutes" premise.