The bad decisions from F1's past it has to change

Formula 1 is in a period of intense work to shake things up for 2021, but that won't be easy. Several fundamental problems that F1 chiefs need to tackle can be traced back to bad decisions taken in the past, when those in control weren't always thinking about what was best for F1's long-term future. Can these issues be fixed in time for the promised 2021 revolution?