Wenger failed at step 1, player recruitment. Every supposed problem is a consequence of that. I think there are two ultimate issues which far outweigh any other.
- Youth
- Injuries.
We have over 10 players in the squad who are under 24 years old. Go have a look at Chelsea, Bayern or any other top clubs squads don't have half as many under that age. As a result, we as a team continuously pay for inexperience. Constantly, on a weekly basis. Chambers is the most recent example.
We seem to introduce young players, almost for the sake of youth, as opposed to bringing in special talents who are able to perform beyond their age. Even then, only one or two are worthwhile, but almost half our squad is below the age limit. There's no way Fergie's Fledglings would have won the title in today's era, that's for sure.
Injuries is well, self explanatory.