This. Reliability in F1 20+ or so years ago was appalling, even though cars back then had the complexity of a toaster compared to the hybrid cars of today with

This. Reliability in F1 20+ or so years ago was appalling, even though cars back then had the complexity of a toaster compared to the hybrid cars of today with their split turbos with energy recovery. Advancements in CAD/CAE simulations really made an impact since manufacturing tolerances were never an issue.