Safe way to wire CMOS ICs together
CMOS devices normally have a high input impedance. For the 74xx and similar logic series this information is often provided in a family guide instead of being repeated in each datasheet. For example the Philips 74HC/HCT/HCU family guide shows on page 6 the following that indicates a maximum input current of 1uA for the 74HCXXX series:



So while your wire will have a very small resistance in reality very little current will flow into the input pin, so it's a safe and common thing to do.