https://www.cnet.com/roadshow/news/2019-subaru-wrx-sti-changes/

The base 2019 Subaru WRX now comes standard with the company's 6.5-inch Starlink touchscreen infotainment system, which has Apple CarPlay and Android Auto support. Last year, the base WRX had a 6.2-inch touchscreen without those features. Moving up the trim roster, the WRX Premium and Limited continue to offer a 7.0-inch touchscreen. The WRX had not previously offered CarPlay and Android Auto, even though other newer Subarus like the Crosstrek and Impreza had added it.

The changes to the 2019 WRX and WRX STI are mostly beneath the surface.