Soooo using rinnengan or not using rinnengan is a excuse.. Okay, I respect your opinion.
Are u 0,5 year old ?
Lets say you have feet when you are 0,5 year old, but you can not run yet, you even barely to walk. And you say "if" i have feet i should able to run WHEN YOU ARE JUST 6 month old.
Ps. replace it with rinnegan and u see how stupid it is.