Remathilis
Legend
Lay the setting down, sort it out, get it right, release it, and then leave it alone and go on to making the next one. Put another way: release the setting as a single snapshot in time, with at least enough history given to explain how things got to the point of that snapshot, and stop there. Do NOT be tempted to "officially" update or revise it later.
The two biggest factors to why a setting changes is a.) mechanical update and b.) change in player taste/sensibilities. The Dragonlance of 1e isn't the same Dragonlance of 3e or 5e for no other reason than D&D isn't the same in 1e as it is in 3e and 5e. Classes have been added, rules have changed. Re-releasing Dragonlance adventures, even with all the ACs going upwards, still wouldn't work because the game assumptions (and audience assumptions) have changed.
I mean, if we followed this concept, Greyhawk would have ended at 1e, Ravenloft at 2e, and Eberron in 3.5. What settings would be using for 5e? Exandria? Ravnica? You might as well not bother making setting material and do a generic "World of D&D" that is never defined except it contains whatever is in that edition's core and splat books.
I get the desire to have things remain forever the way you found them, but preserving them in amber is a terrible way to keep the game alive.