"There's a difference between using 'soft black' and using low-contrast gray." > every device can display the text comfortably according to the characteristics

"There's a difference between using 'soft black' and using low-contrast gray." > every device can display the text comfortably according to the characteristics and preferences set by the manufacturer (or the user, if the user disagrees with the manufacturer) Right, every device; seems complicated, requires intervention. That or, design the site well.