Quest exotics vs RNG-drop exotics
Every Destiny 2 exotic weapon reaches your vault by one of two paths, and the path decides what an acquisition service actually does. A quest exotic has a fixed, deterministic chain — mission steps, activity completions and often a puzzle sequence — and once the chain is finished the weapon is guaranteed. Divinity is the extreme example: it needs a full Garden of Salvation raid clear with precise encounter puzzles that stall most casual groups, so the job is coordination and mechanical knowledge, not luck. Get to the end and the drop is certain.
An RNG-drop exotic is the opposite. Raid and dungeon exotics like Vex Mythoclast, Eyes of Tomorrow or Heartshadow only appear on a low-single-digit-percent roll from the source activity's boss, softened by in-game bad-luck protection that nudges your odds up after each dry run. That means the service is a repeat-until-it-drops farm rather than a fixed checklist, and completion time swings with your luck. Because the timeline is open-ended, a guaranteed package — one price, unlimited attempts until the exotic lands — protects you from a cold streak that a per-run purchase would not, which is why it's the better value on the rarest drops.