Color film also requires more light. By making all elements of the film sensitive to all visible light, your essentially triple it's sensitivity to light vs color.
Can you still buy those types of cameras, or do you have to go to antique shops to get them?
Man, having an old camera like that would be so cool. You could use them to make movies and stuff, too, and avoid disputes over whether video was authentic or a deepfake.
Unfortunately the only cameras that still use 35mm for sale on the market are point and shoots and leicas as far as I know. There is definitely a great variety of tested and we'll maintained cameras for sale online.