I knew a little about the Ford Ecoboost before I purchased my Mustang. My daily driver is a 2014 Ecoboost Fusion with the single scroll turbo and 2.0 motor. And still running strong, 12 years later with close to 100 thousand miles.
In 2015, when Ford went to the dual scroll turbocharger, they added steam slits to the 2.3
block, I assume for increased cooling. They did the same thing in 2017, when they released the TS 2.0 motor, for the Ford Fusion.
Ford didn't invent the steam slits, I've seen them in other motors, built by other manufacturers.
To my knowledge, all Ecoboost motors built by Ford, now uses a steam port, instead of the steam slits.