Raw meat can carry salmonella, toxoplasma, and other pathogens that threaten both the cat and vulnerable household members, and freezing does not eliminate all of them.
Home-mixed raw diets commonly drift off balance in calcium-to-phosphorus ratio, taurine, and trace minerals, especially with a single meat source.
Whole or ground bones can fracture teeth, injure the mouth, or obstruct the gut, and raw-food prep surfaces need strict separation and disinfection.
Major veterinary bodies generally advise caution with raw diets; if you still consider it, discuss formulation and testing with a veterinary nutritionist first.