Urban myth.
I successfully applied for a mortgage with ~30 credit cards open. Nobody batted an eye, or even commented on it. They looked at balances and credit score. Balances were almost all zero and credit score was excellent.
A hundred small loans that were all paid off on time over the last decade is extremely helpful getting you a mortgage, it doesn't hurt.
> Balances were almost all zero and credit score was excellent
Not the same.
> hundred small loans that were all paid off on time over the last decade is extremely helpful getting you a mortgage
Again, not the same.
Affirm can be worse than credit cards because credit cards are a single line of credit of X size. The people using it don’t realize that a bunch of tiny lines of credit add up to a larger one ultimately and they can find themselves overleveraged.