When I wrote PURE chili powder I meant PURE not a blend. I will make powders from ancho, guajillo, New Mexican, cascabell, mulato, pasilla and arbol. Japones aren't as available here as arbol. I like experimenting with different combos. Cumin for sure, paprika not so much. I also don't put beans in chili, but I do put chilis in my beans.
I always use the rule that if it's spelled 'chile' powder it's meant to be just dried ground chiles. If it's spelled 'chili' powder, it's a seasoning blend including chile powder, cumin, oregano, etc.