if we are discussing purely walking (running is different mechanics)...
A normal gait pattern should ABSOLUTELY be heel strike first.
Toe walking is often a sign of a neurological disorder/autism/etc in children (although earlier than age 4, it is ok...if I am remembering correctly...but when kids first start walking, it is normal to be toe walking)
If an adult is just voluntarily doing it...it is just bad habit. If you are consistently doing it, it will most likely start causing issues up the chain (i.e. ankle, knee, hip, back pain)...or just REALLY start wearing on oyur big toe joint. Your body is designed to absorb the shock of walking in a very specific manner...toe walking alters everything.
Sael....where did you see that toe walking was good??????