Thank you for the explanation @EA_Aljo. The logic behind the answer actually makes a lot of sense theoretically, but does not even come close to how the game is setup.
I'm not really sure where to start and I want to keep this short, like @heavydutyrammer said, this isn't GM mode, its Franchise Mode. A GM is not responsible for upgrading facilities, but we can do that in the game as well as some other very unrealistic things.
I'm fine not being able to change my coaches strategies, actually agree with it, but as the GM if I don't like how my coach is handling the team, I need to have more options on what to do. If this is the dev's response and they are sticking to it, then we need way more NHL head coaches available to be signed because right now there are none in the first season. We would actually need the ability to pick our coach when we start a new franchise instead of being assigned a random one and having to keep restarting the mode until we find one we like.
Also, see what @Caliboy6262_714 said in another post about strategies not changing with a new coach, I did not know this was a thing and haven't tested it myself, but I do believe it.
As far as editing players, we can edit X-Factors which have more impact than player type/position, so that logic goes right out the window. (Note: Do Not take this as a statement that I want the ability to edit X-Factors removed)
Again, editing players wouldn't be as big of a problem if the game was programmed properly where player types actually match attributes and weren't randomly assigned.