There are these other people at the table, called.players, and they frequently feel no need to be restricted to what the GM plans.
One of the foremost reasons some GMs give so much detail is that they abhor players adding material, so they must include everything the players might interact with.
My concern isn't players adding material, it's that if the players are left to fill in gaps in the description they will; and end up in their own minds filling in different details for a given element than each other and-or the DM.
Which is fine until-unless they start acting on those filled-in details.
But, if you aren't one of those GMs, then you are adding detail as you go, for which you don't have a plan.
I'd assume the DM knows the details already, but just isn't describing all of them until-unless asked. In other words, she does have a plan.
But if the players have been trained to fill in their own details rather than asking for more detailed descriptions, that's a headache waiting to happen every time those filled-in details conflict.
Hypothetical example using something from upthread:
Tonguez said:
The Grand Hall overwhelms with the scent of old oak, bitter wax, and a hint of lavender drifting from a marble vase. Stained-glass scatters a kaleidoscope of light across the mosaic floor whose beasts and vines seemingly writhe challenging you to enter.
Aspects: 1. Heavy with Old Scents, 2 kaleidoscope of Light, 3 The Floor writhing 4. Vase (treasure?)
- Theres your description shortened to 3: Aspects and an Asset that can now be explored and invoked.
The DM knows the stained glass depicts the story of the fallen king and holds a vital clue to future endeavours (that's why she mentioned it).
Player 1 fills in to herself that the stained glass is just patterns, depicting nothing, and ignores it.
Player 2 fills in to himself that the stained glass is valuable and starts cutting the windowframes out of the wall.
Player 3 fills in to himself that the stained glass is what's making the floor appear to writhe and starts shattering it with slingstones.
All the while the vase is just a vase, maybe worth a few g.p. but otherwise a red herring. Meanwhile the description has left gaps big enough for players to interact with the stained glass in every way except usefully.