I really agree with you, but Unity's camera can be really frustrating cause it builds a game in different dimensions than it shows the same game in Editor at full screen resoultion :< , especially for 2D games, so 2 & 4 could be somewhat ignored...
2) can probably be ignored (or can have a different color background image above) 4) i feel is quite important as once I see the enemy, it is too late to move, so need to move it further back.
