I understand that getting a professional knowledge in coaching introduces an individual to aspects of a sport not known by all, but oftentimes i have witnessed individuals (spectators) of a sport, due to extreme love for a sport become masters of a sport so much that it seems almost like they now know the sport better than some coaches.
Whenever a game is going on say football, you always hear such individuals question the coach's line up and tactics, you hear questions like -
-Why is he (the coach) not playing player xyz?
-why did he (the coach) use player xyz instead of players zyx?
-why is he (that is the coach) using this formation instead the other one? and so on.
-Is there a possibility that spectators of a sport like you and i with no professional training can develop a better understanding of a sport than some professional coaches of some teams?
You know, everyone thinks that they are the professionals and they know everything better. Just have a look at your life, there are a lot of people who didn't succeed in their life and are average or below average Joes but give you a lot of advices about a lot of things. Some may say that you need to marry ASAP, some may say that you should never marry, some may say that you should get high education, some say that sport pays the better and so on.
The same applies to your question. Maybe in certain moments the spectators can be right because in each different situation, each individual may act differently. People don't know what's happening behind the scene in matches, maybe there was different dialogue/communication between the coach and the plays? Maybe player XYZ asked the coach to play player ZYX instead of him? Maybe coach wants to give a chance to player ZYX to probably shine?
There are really a lot of reasons behind every decision, people just judge it easily.