Oofta
Legend
It isn't the same in all cases.
For example, I have run a significant number of one-shot scenarios in which the PCs are pre-generated, with pre-written backstories. In such a case, it may not be inappropriate to insert memories, as that history is not entirely in the player's hands.
I will sometimes add commentary about what the character thinks when we are considering a competency the character has that they player does not - if the player can't be expected to know what something means, but the sheet says the character would have an idea, I provide it. Similarly, some games have elements where the player specifies how the character feels about a thing (like, say, a flaw saying the character is an alcoholic) that give insight into ways the characters thoughts and emotions are not really under their control all the time - it is fair game to tug on those strings if the player has provided them.
While I don't disagree, I think there's a difference between describing emotional reactions and remembering something. So "you know from your time aboard a ship that having full sails in this kind of weather is extremely dangerous" vs "there's a cold pit of fear in your stomach as you hear the void of your nemesis Tim". Assuming of course that Tim doesn't have a fear aura.
One is telling them what they know, the other is telling them how they feel about something.