Loss of control in flight (LOC-I) is the type of accident with the highest number of people loosing their lives in aviation. It is not the most common type , but it is the most serious.
EASA has made this a focal point and consequently introduced the requirements described in ‘Air crew regulations part FCL 745.A’ per 20 dec 2019
All new professional pilots to have the ‘advanced UPRT course’ according to ‘Air Crew regulations part FCL 745.A’.
This means it must be introduced into the integrated ATPL and MPL courses, a requirement for modular CPL(A) course as well as being a prerequisite for the first type rating.