A sane reality warper is less powerful than an insane one.
Franklin can create pocket realities but I'm not sure of how his actual reality changing powers work.
I think Jamie is limited to matter, he "pulls the strings of reality", I'm not sure if he can affect energy, supposedly Jaspers could, although Jaspers needed something to mould (as per his 'original' death). Jamie on the other hand isn't getting more insane and destroying an entire universe.