Maybe because it wasn’t a power set that on its own, pushed to the limit, that really interested the main “architects” of the Marvel universe??
Marvel has always struck me...certainly in its early decades..as a much more coherent integrated universe than DC. If you put in a light speed character ..as a regular big character..it maybe makes too many of the big stars (Spider-man, Daredevil) look a wee bit ineffective.
DC architects have never bothered about overall coherence (we’re supposed to believe Batman or Green Arrow can go up against gods, for pity’s sake)...but maybe Marvel wanted a more coherent feel?