Quench is still important with dished piston design, and the area outside of the dish needs to be as large as 50% of the total crown area for optimum quench.

1994 Magnum 5.9V8 factory pistons are over 40% quench area.

The small details in the design of the edge of the dish are important too.

If the edge is designed right,
the straight line inward moving fan jets of "squished out" air and fuel
then 'tumbles' as it goes over the edge of the dish and downward.

Diesel pistons in particular make use of this tumbling turbulence in addition to the squish turbulence.