I know this isn't really a serious issue for the game right now and there's a very plain workaround for a lack of re-customisation if you're not sentimental (though I think many players are), but not having the ability to change a character's race/gender/facial features after creation has been a long-standing nagging pain point throughout this whole franchise's lifespan. Having to vault everything, manually delete a character, and start over from scratch is an irritating inconvenience and an oddly long way to have to go just to change a character's appearance. It's like trying to use a massive cinder block just to hammer a single nail.
The desire for this feature got even stronger following the launch of Beyond Light when character facial features were altered slightly as a side effect of the updated coding behind facial customisation. I imagine there's a ton of players out there, myself included, who are dissatisfied with their guardians' updated 'new' looks following these game engine changes and want to be able to tweak things without deleting characters we've invested hundreds of hours into.
Personally I think this is a feature that should've been in the first Destiny AND Destiny 2 from launch, and I've always been holding out hope that [b]*some day*[/b] this might actually be implemented.
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I'm sure Bungle has "Top Men" working on it. Likely the hold up is figuring out an easy way (for them) to monetize this so that you have to jump though a tonne of hoops (i.e extending your play time via Bounties and running hundreds of Strikes, Crucible or Gambit matches) using only existing assets and then once a Season you will earn the Right to change your Guardian appearance - within Gender Fluent Non -blam!- limits enforced by Bungle - for Silver.