The UI/UX and interface is fantastic, you have some master artists and engineers to create what was linked here DTG reddit a few months ago: Destiny 2 UI + Visual Design
I'm going to go further and commend the Bungie API team for allowing the infrastructure and engineering for 3rd Party applications like DIM, Destiny Sets, DestinyTracker, Lowlidev, Destiny Checklist, and more to thrive.
Being able to swap characters all the while shovelling all your good gear onto the new swap during the loading screen using DIM, or checking Guardian Raid stats on-the-fly is done subconsciously but I took a few minutes the other day to really appreciate how many API-empowered apps makes Destiny a fantastically streamlined experience.
Big S.O. to /u/EdgarVerona and the team he works with.