I might be misunderstanding
@tetrasodium, but I see their point as being a stronger version of the below:
(1) Different campaign settings have different expectations as regards the power level and availability of equipment and magic items. That seems pretty obvious to me given the examples given of Eberron versus Dark Sun - both of which have pretty divergent expectations from each other and from the PHB baseline.
(2) The game system should be built from the outset to
smoothly accommodate these differences.
(3) If you wait until you're developing the setting books to do this work, it's too late - the system will be inflexible and the adjustments creaky and ill-fitting.
Now, personally, I don't know that I'd want those changes to equipment lists in the PHB, but I
do think the DMG should have more support on running games that line up with the different "flavours of fantasy" discussed therein. That includes how to change equipment lists to match:
- "low fantasy" - swords & sorcery and pulp-style stuff
- "medieval fantasy" - which is a bit lower-tech than the more early-modern PHB gear
- "magitech" - Eberron and the like.
So some alternates should be in the DMG at the least, IMO, even if a more fulsome treatment of running games in those settings, including more equipment, might wait until setting-specific supplements are released.