Tiktaalik had the earliest known neck in our lineage.
It was probably useful for things like grabbing prey and breathing (sticking the head more out of the water). When fish are in the water they tend to use suction to swallow up prey and can orient their body in 3 dimensions to go at it. On land you're suddenly a lot more 2-dinensional in how you can move around, you're stuck on a surface. A neck helps bridge a little bit of that gap.
Tiktaalik had the earliest known neck in our lineage.
It was probably useful for things like grabbing prey and breathing (sticking the head more out of the water). When fish are in the water they tend to use suction to swallow up prey and can orient their body in 3 dimensions to go at it. On land you're suddenly a lot more 2-dinensional in how you can move around, you're stuck on a surface. A neck helps bridge a little bit of that gap.
In conclusion: we must return to the ocean.