I guess it was bound to happen. Road bikes never used to mention rider weight until we all followed the anorexic racers into stupid-light frames so they could climb Mt. Everest (or the Italian/French equivalent). Mountain bikes were rugged when they were invented, then suspension came along to soak up the shocks, and tube weight went down to try to keep the overall frame weight from soaring. Fat bikes were like the original MTBs 8-10 years ago, so now it's time to see if they can't be lightened until larger riders might break them.
But machine built wheels are still the achilles heel for heavier cyclists.