I recall several times seeing people wonder why PD mostly created their own GR.4 cars when real versions existed, and thinking about it, the answer is simple:
GT4 as a class had just started to take off when GT Sport was launched, with most of the GT4 cars prior to 2016/2017 being privateers efforts in regional championships rather than the focused worldwide class we see today.
That's why the Porsche GT4 Clubsport we have is one of the only real life GT4 cars we have in the series, as when GT was developing the cars that would launch with GTSport around 2015-2016, there simply were not enough GT4 or TCR cars (the latter of which was also still brand new when GTSport was in active development) to both scan and model.
Of course nowadays with both GT4 and TCR having taken flight, that is not as much an issue as we have seen from the Elantra TCR now being in the game, BUT with the focus having shifted more towards road cars, and the race car selection having to be balanced between contemporary race cars, brand partnerships (Mazda 3, RX Vision Evo, and Suzuki VGT) and classic racing cars, combined with the sheer amount of carryover content from GTSport means that new real GT4s (of which we have essentially gotten none) seem devalued compared to the ever popular and in demand GT3 cars (of which we have had the 296 GT3, 992 GT3, updated AMG GT3, and a new RX-Vision, with rumors of the M4 as well)
