Why aren't you out there in the tournament scene representing close to extinction Killer Frost?
Killer Frost vs Doomsday on paper or should I say in textbook is nothing of actual gameplay in the real setting. College textbook material vs Applying knowledge in the real world.
Just because Killer Frost has a Slide, Vortex 50/50, MB Parry, great F3, good D2 solid tools is not the same being applied to actual high level play. In a real match she lacks footsies given short range normals which is why she is forced to slide and air dash or walk despite it being slow even worse her forward dash long recovery. She lacks air control and no access to interactable use compared to power characters unless she is on certain stages. Her wake ups can be baited, her blocked slide will put in her the post-slide guessing game sometimes will be in her favor, her vortex 50/50 requires meter management she may need it for wagering clash or if her opponent clashed after she burnt nearly all her meter. Life lead in majority of her match ups is important and she can struggle hard time getting it back on defensive turtles, she can be lamed out hardcore by characters like Cyborg, Martian Manhunter, Bane, Zod, Hawkgirl, Harley Quinn, Raven, Aquaman, Black Adam, Superman, Wonder Woman, Green Lantern, Solomon Grundy. In this case, if Doomsday had the massive life lead he can lame her out and basically let Killer Frost hang herself as he stops her types of offense. All these factors is not the same as theory crafting on paper textbook definition: Killer Frost beats Doomsday 7-3, it just doesn't work that way.
Killer Frost vs Doomsday
Textbook definition: 7-3
Real World Experience: 5-5 or 6-4 (Although it has not happened yet)