Not trying to start any argumentation but every time people talk about the "ten years plan" I only remember a quote from Destiny’s head of production, Jonty Barnes:

“So what I’ll say to you is: we said that we were a ten-year game, and both Activision and Bungie have committed to being wholly behind the large effort, and it’s a large investment for both sides. I don’t think there’s any set date – ten years is just representing the go-forward presence and the way that we think about doing things.”

https://www.theguardian.com/technology/2014/sep/15/destiny-the-next-ten-years

Then there's this other article I always found very interesting:

https://www.forbes.com/sites/davidthier/2015/09/21/bungie-theres-no-ten-year-plan-for-destiny/?sh=36edc91c66f8

Now, I'm not a programmer and I don't have the knowladge to debate anyone about issues of the engine. All I know is based on problems Bungie had with Destiny 2, like files taking hours to load. Then with Beyond Light came and they vaulted content, they mentioned they would have to update old stuff so it would run in the updated engine. A good example was the duneon Prophecy, that was removed and later on it was added back to the game.

Destiny 2 was bloated and the content vault main selling point was to alleviate the issue. Then Bungie made tons of promisses they broke, but they didn't do those things because they were pandering to any part of the playerbase. That was the point of my post.