Cashshop

[ThirdChild_ZKI]

If they were to make cash shop items available in game, I would expect it to be gated behind some kind of ludicrous grind, so as not to completely discourage sales.

You'd either grind for it like a relic, or just buy it.

[Bourne_Endeavor]

Destiny 2 is bleeding players daily. They've only made this decision out of desperation to save the ship they put holes in to begin with.

And like ThirdChild said, if Mogstation items were obtainable in-game, expect absurdly long grinds.