That proves that it doesn't even matter how good history in your career as a footballer and there is no guarantee if you will be a good coach. In fact, so numerous players that shifted to be a new coach were only a few that was successfully become good coach.
Those english coaches were not having good passion to become good coach. Xabi alonso has been successfully bringing leverkusen to increase from the relegation zone while english coaches were sending the team to the relegation zone.
Players and coaches are two areas that I consider distinct. While there are some common points, such as understanding all the playing strategies. But I think that wanting to transition from being a player to a successful coach requires many additional skills related to human management, unlocking players' potentials, identifying the strengths and weaknesses of the team to develop improvement plans, like adjusting tactical formations or buying or selling players suitable for the team's style of play.
Moreover, coaches must be a psychological master and, importantly, capable of pulling the strings for the entire team and resolving everything in the locker room.
As for Rooney, I don't rate him highly in terms of coaching because his personality is not suitable to become a good coach. Example, Ronaldinho or Neymar might be extremely talented players, but become a coach is a different story.
I don't know if this is related or not. But what I see from most players who end up being successful coaches are those who weren't forwards to begin with. Most successful coaches come from players who were originally in the back line or midfield.
One example of a former defender who succeeded in becoming a coach is
Jurgen Klopp and Arteta, who was originally a midfielder.
Maybe this is related to the position of the defender who has experience monitoring the movements of the middle and front players from behind, and they also have experience in how to stop the opponent's attacks. Meanwhile, their forward players are more focused on attacks and may not have enough insight into stopping the opponent's attacks. But this is just my opinion based on some trainer data whose background I know. It is possible that many forward players will become great coaches. But so far I know that most former defenders and midfielders have become great coaches. Other examples include
Ancelotti and Spalletti.