Gasket thickness has nothing to do with why MLS gaskets are used.

Multiple Layer Metal gaskets have a very thin sprayed on silicon coating for Oil sealing and the very nature of a Steel gasket makes it superior to a composite gasket for boosted applications.

Nismo or Nissan Motorsport Composite gaskets differed in generally two ways from stock gaskets they were often Bigger bore for overbored engines and they all had a Stainless steel ring behind the fire ring area embedded into the Gasket.

That embedded ring directly at the back of the visible fire ring is why with Nismo or FIA gaskets a requirement was always a light reface when using them because they left an indent in the alloy of the cylinder head unlike stock composite gaskets or for that matter MLS style gaskets.

Modern useage of MLS gaskets by manufacturers is simply to remove any necessity to retorque an Engine after initial useage thereby saving time and money plus adding reliability for the manufacturer.