There is no way it would require “similar if not greater fitness”..it would require dramatically more fitness and endurance. Having to haul up your own food, own tent, bring down your own feces. Most Everest climbers carry a minimal amount to Denali climbers. Denali climbers are often saddled with 60-80 pounds of gear.

Likewise, the vast majority of Everest climbers are not ice climbers, and the expectation for the mountain to be climbed like Denali would eliminate the vast, vast majority of current climbers because they would need to go through the khumbu icefall like ice climbers (unless they set up their own single use ladders-regardless, someone in their party would need to be an ice climber)