Resistors are not required for the LEDs because the 4026 IC limits the current to about 5mA for each LED.
The internet is full of idiots and you just found another one. Low current means that is all it can supply safely, you put a honking big load on it and you over stretch the absolute current ratings.
and it seems to run okay
And you would know you are drawing too much current because?
It is when it suddenly stops working for absolutely no reason. Don’t be another idiot.