Here's another (unrelated) observation:
In the 2014 DMG, we have Pistols and Muskets. Bullets cost 3gp for 10, are destroyed on firing, and there's a Powder Horn for 35gp (though it only passingly mentions that the powder is used to fire the bullets, and has no rules on how, or any way that the horn becomes "used up". But the fluff is generally there.
There is no mention of gunpowder in the 2024 PHB at all., AFAICT. Now, I think we can assume that the 3gp per 10 bullets includes a cartridge of powder and a wadding, but it would be nice to mention it, I think.