If the player is happy, then why break something and invent a wheel? And the developers should have preserved the integrity of the trilogy. So we got three whole cities, a lot of opportunities and little things, as well as another decade with new heroes. And the player was satisfied, so much so that many GTA players still have this part as their favorite. But technically, for example, in terms of graphics, the game is hopelessly behind its time. Especially in comparison with the same Half Life 2.
It was during GTA: SA that modding became a widespread phenomenon, and scandals associated with the series and developers became regular.