It is much easier to list the very few (but very important) applications for which FP64 is not necessary: machine learning/AI, graphics and video and audio proc

It is much easier to list the very few (but very important) applications for which FP64 is not necessary: machine learning/AI, graphics and video and audio processing, other digital signal processing. The list of applications for which FP64 is required is huge, but they are less known because they belong to scientific/technical computing. Any design engineer would use such applications, but most programmers and non-professionals would not be familiar with them.