There seems to be a very limited amount of long-term strategy variation involved in high-level elite seasons. In new era of 2020, if we want to have more long-term strategy variation, we can do something on tyre suppliers.
2 Choose 1 for durability (A or B):
A. Goodyear could offer significant SS & S durability, but at a sacrifice for speed.
B. Bridgestone could offer significant M & H durability, but at a sacrifice for speed.
2 Choose 1 for speed (C or D):
C. Pirelli could offer significant SS & S speed, but at a sacrifice for durability.
D. Dunlop could offer significant M & H speed, but at a sacrifice for durability.
2 Choose 1 for wet weather tyre (E or F):
E. Michelin could offer significant wet weather tyre (Inter & Wet) speed, but at a sacrifice for durability.
F. Yokohama could offer significant wet weather tyre (Inter & Wet) durability, but at a sacrifice for speed.
So we can choose 3 suppliers in all six for significant speed or durability. Therefore, your results and your pace won't just only depends on the level of Design & Tech HQs, and the amount of CDs that you've hired.