SpaceX Raptor engine was designed using a full engine combustion simulator, without which the engine would have been impossible [1]. Not to mention the rapid evolution from Raptor 1 to 3 [2]
Jet aircraft are 70% more efficient since 1967, largely from simulation [3], similar in automotive
Unclear how the NVIDIA H100 would have been designed by hand-drawing 80 billion transistors
Net-net: Computers necessary, but we need much better UIs and systems. Maybe AI will help us improve this