A squad full of sick notes?

Mendy
KDB
David Silva
Aguero
Stones
All of these key players are routinely out for a month or so every season now. That's not including Sane and Laporte.
Compare that to Liverpool who have had Salah, Mane and VVD out for periods, but never seemingly as long and maybe only Salah gets injured each season now.
Is it training methods or the players?
Kun's injury record has improved, but it is hard not to notice. In this year's version of the game Football Manager 3 of these are listed as injury prone:
Mendy
Silva
and now KDB (who wasn't listed that way before)
Kun used to be but that's changed and I expect Stones to get that designation in next year's game.
KDB
David Silva
Aguero
Stones
All of these key players are routinely out for a month or so every season now. That's not including Sane and Laporte.
Compare that to Liverpool who have had Salah, Mane and VVD out for periods, but never seemingly as long and maybe only Salah gets injured each season now.
Is it training methods or the players?
Kun's injury record has improved, but it is hard not to notice. In this year's version of the game Football Manager 3 of these are listed as injury prone:
Mendy
Silva
and now KDB (who wasn't listed that way before)
Kun used to be but that's changed and I expect Stones to get that designation in next year's game.