Did you read his post, or even the tl;dr version? His thoughts are that if everyone has it, they'll buff the enemies health, particularly bosses to the point that it almost requires Gjallahorn. New people who don't have it will hurt because of the enemies health buff, and they don't have Gjallahorn. I'm not saying he's right but that's what the post says.
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Exactly, that or they'll have to nerf the Gjallarhorn, which I actually wouldn't opppose if they, say reduced the Wolfpack round damage by about 50%, but knowing the community, people will probably throw away their copies of destiny complaining "oh I earned my gjallarhorn blah blah blah". It simply will not work out in the end.