1, [b](Re)Grinding[/b] - Think a big reason why many players don't enjoy grinding anymore is because the game loop has been very stale & predictable for years on end from a macro perspective - if the game doesn't considerably update itself on a semi-regular basis, people get bored/tired of the same old same old and move onto the new freshness somewhere else...
2, [b]Serving the Audience/Quality of Content/Management[/b] - Reality is, Destiny doesn't cater it's audience, it has previously tried to extract the most from the least possible resources, relying on gimmicks and cheap burn content on average - seasons/episodes are at a very poor quality and the team isn't agile enough to shift development at a fast enough pace due to poor management, institutional bloat and a of lack of overarching vision. I like Tyson Green and think their vision for the game is what's been needed for a long time, If this can be executed and at a pace that can retain/grow players remains to be seen.
3, [b]PR & Trust[/b] - As much as I like Destiny 2 for some things, Bungie has destroyed a significant part of their own fanbase. Goodwill and trust is sorely lacking, to the point many want to see Bungie fail due to the volume of their mistakes & perceived arrogance - Bungie is not a likeable company, as much as some might think this doesn't matter, it often has a large impact on overall game sales and marketing.
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I never praise a company but the fact that Bungie told people who had Early Access that they're willing to make some changes down the road if edge of Fate needs more development that they're willing to do that just like what they did for Destiny 2 2017 release remember they had to change almost the entire game because it was too casual. However after shadowkeep with seasons introduction was terrible boring and dull rewards were so genetic. The way heresy is that is how every season should had been harder grind for new rewards with a strong story. Some people don't like the doctrine dungeon but to be honest it's a good dungeon the rewards are worth it, but when you have a good team and not a bunch of players who act like they got their head stuck up in their -blam!- and they don't know how to work together as a group like they never played a sport in their life. These kind of players will fail in edge of fate.