No sure that you can compare Franklin’s powers with being invisible or stretched but the big difference is that the other Richards weren’t born this way.
No matter what there is in Franklin’s DNA, Franklin and the Krakoans have in common to be born different and it has made a difference in their upbringing and the vision of themselves.
What is different from the Krakoans is that the status, the wealth of the Richards has shielded Franklin from being cast aside because of it. But it’s something that Charles Xavier, particularly, could unterstand.
And the mutants, villains and the others, joined together to have clout.