Working on R-1234yf systems is not that different from the R-134a variety.
This “staggered” transition to R1234yf creates a problem for shops servicing these vehicles.
The benefit of R1234yf is simple. The new refrigerant lasts only 11 days in the atmosphere compared to 13 years for R134a. This is why the EPA is requiring R1234yf to be installed in all new systems by 2021.