Jurgen Klopp's training methods have injured by far the most players per game of all Liverpool managers since 2002.
These injury stats are very similar to Klopp's period at Dortmund. At some stage at Dortmund he had destroyed his squad to an extend that Borussia was fighting against relegation.
Even when a coach has by far the worst injury record in 15 years, people still focus on excuses & external factors.
This is the main reason why things only change slowly in football.
Excuses, emotions, blaming external factors, denial, denial & denial.
Pilot actions in a plane are recorded by a black box. Maybe it's time to put a black box in the coaching staff room of Premier League clubs.