Replying to lightness- a false necesity or important mechanism

me and my buddy were discusing the importance of light gear and how it improves your skills. in the snowboard industry light is key, but just pick up some ski boots, and see the contrary. im sure lighter gear would improve ollie performance and spin speed but in turn would reduce equipment durability and strength.
any gurus out there, that know their shit? we are talking life and death here folks....