Adding characters to a fighting game later is certainly not something that KI invented. Also, in KI you have to pay for the additional characters, in SFV you do not. Your statement is 100% false.
Its new to fighters and it was VERY much hated on by most the FGC not because of the model, but because it was on xbox.
You are incorrect, you have to pay for the new characters in SF5 if you want them however with enough time played you can unlock them with "fight money" In KI you get rotating free characters. You pay for all new content in sf5 not balance updates. Much like KI