There's been a big kerfluffle in the online brewing world this year over "LoDO" brewing aka Low Dissolved Oxygen brewing. Proponents of the extremely complex methodology theorize that by reducing the amount of oxygen entrained at all times in the mash or the boil that you prevent oxidative reactions that damage the beer's flavor and reduces the overall malt character.

The reason they're obsessed is they're driven to recreate the "it" character they claim German beers have with their malts that they find lacking in many commercial and homebrews.