People die either way. People die because treatments sit in the lab for years instead of in clinics.
Consider the FLASH oncology treatment. In 1995 Dr Fauvadon figure out how to make radiation therapy much much safer. He spent 14 years before sharing it in 2009. In 2014 it was actually published. [1]
The medical equivalent to "move fast and break things" would be "move fast and kill people"