Pump foil start

The slightly different pump foil start.

I still don't understand the jump start. Why would you want to jump after the pump foil board and lose all control over the dock start?
What's more, I've never needed this start, whether I'm on a lake in Switzerland or out at sea. In fact, the opposite is true: so far, I've found more rocks, boulders, and jetties at lakes and the sea than walls to jump off.

Yes, I'm well aware that this video was shot on a perfect jetty. However, the start I use is also ideal for pump foil starts from rocks or boulders.