I also wish EA and Codemasters would put more circuits in the F1 games, but my understanding is that the real-world F1 is pretty strict about what circuits are in each game. The real-world F1 is going to start doing more rotations with the schedule, so it's likely there will be more circuits in future games.
For example, Spa-Francorchamps and Barcelona-Catalunya are going to start sharing a spot. Spa-Francorchamps in 2027, 2029, 2031, etc and Barcelona-Catalunya in 2028, 2030, 2032, etc. Spa is my favorite circuit, so I really hope it stays in the game every year.