I already explained it. When you give people everything at once, there is nothing to do. Simple example would be somthing like a pinnacle quest. You should always try to find a middle ground. People complain that wendigo takes too long to obtain therefore they get bored and don't want to do it, therefore limiting player choice to a degree. On the other hand make it too easy and short and people will have no reason to replay the activity that the quest took place in. In this case strikes. It would also mean every single person and their mother has Wendigo and thus if wendigo is the best burst dps option in the game (which it currently is) then you have limited variety in what players use and also made it harder to balance the game for pve. Obviously this is a dumbed down example, there are more reasons to play strikes but its more the concept behind it which can be applied to anything. There is also the difference between short. Medium and long term goals which many people seem to not understand in the slightest.