Not to mention the still-missing 924 Carrera S and 928 GTS, as well as the other missing from the 360 era like the 986 and 987 Boxster, the 987 Cayman (and R variant), and the 997 911 Sport Classic.
I'd even argue that some of the missing 911 variants deserve a slot in this game (maybe like the 991 R, the 996 GT2, and 991.2 Turbo S Exclusive). I think the 356 RSR Emory is a cool car, but Porsche has such a wide selection of other models not currently in Forza (or missing for some reason!) that really should be getting priority.
My heart hurts for the 928 and 964