I've never seen anyone launch from there?
Do all the ocean sailors stick to Dutchies / Scabs?

Leighton is a good launch spot for slalom/freeride, flat entry with small waves.

If you are just wanting to blast out in the ocean (as opposed to wavesailing) you can pretty much launch anywhere.

I generally launch at Port Beach mainly as it is a relatively short walk to the water, you can rig on a concrete car park and there is likely to be a few others out, particularly guys on race gear to drag against.

The sailing is perfectly fine at City Beach / Floreat but the beach is massive so it's a long walk to the water.

On the plus side, you have nice lawn to rig on plus showers.

Brighton also offers a good combination of lawn, showers, other people sailing and a reasonable walk with your kit.