It is by far the most efficient strategy to level your character. If the game had a more efficient leveling system built into it's more legitimate systems we would be utilizing that. Many other games have leveling systems that put you close to end game levels at the end of story content. So you don't have to work as hard. This game makes you play hours upon hours, days upon weeks even, to get to end game levels. And it makes you play content we've already been playing up to this point.
TLDR: If you Make a better leveling experience, you will get more players who want to engage with it And not *want* to find the exploits.
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People are afk farming because they still can't come to terms with the fact that they bought heavily into a game whose genre and mechanics they aren't interested in but are also to stubborn to admit that the game isn't for them. If it were up to them Destiny would be a game where you collect a few different guns and completely abolish the Leveling/Power Leveling concept to run around in what is basically an ever expanding CoD campaign.