Forever isn't just divergent from the end of Claremont's original run. It's also free of interference from the late-eighties early-nineties editorial crowd.
Back then, the artists who would soon split off to found Image were making Marvel heaps of money, so the editors of the time gave them increasingly ridiculous amounts of creative control. Claremont got irked by this; after spending seventeen years writing the book, he was now just there to script over the artists' plots.