Destiny has been plagued with issues players complaining about game being incomplete information coming from so called ex employees and current employees confirms. Lawsuit have been filled from ex employees saying they suffered from mistreatment with their work not being used. Game left players confused felt half baked with content missing, some users was able to find content had been cut which later turned up in expansions.
Bungie did a complete rework of bunch of voices, redid bunch of gameplay mechanics tried to explain story more during taken king expansion. References to events which did not happen was found appears the game much bigger scope but was unable to meet deadlines. Suffered from poor project management with deadlines forcing ideas to be cut or left unfinished who knows.
Safe to say that Destiny had rough start not many studios would do so much work after launching a title. Only game which comes to mind would be battlefield 4 which still being rebalanced and updated.
Bungie has been detailing it second year plans focus being on events over expansions. Given the amount of effort they put into building expansions plus complete over haul of the game not a surprise.

Before we go any further my experience with Destiny was just the beta.
Playing the beta felt like the game lacked variety, with potential content being thin on the ground plus lacking story. Destiny should had events weekly with different content and new content areas for players to experience with loads of variety.
Hope for Destiny 2 we see some serious variety with serious content plus bunch of community items which basic MMOs have. Before any expansions even appear and when they do offer 50+ hours of content.

Maybe Bungie was trying to do bite size AAA style games who knows.

Destiny felt like half baked shooter with MMO/RPG system that was never finished..
Based on the unconfirmed information from ex employees appears to be correct.

Have no desire to play Destiny when other games do what destiny offers better.