This is not what the game book says
A variation of going out is for a player to draw a card and then play all cards in their hand without discarding. This is known as going out "floating". Because the player must be able to discard a card in order to actually end the hand, other players now have at least one extra turn in which to go out themselves or at least improve their score. In addition, a "floating" player must draw a card and play it if able, and must draw the top card from the discard pile if it can be played; thus the floating player can be forced to play on their next turn instead of drawing and discarding. The floating player can also be skipped as normal. If someone else goes out before the "floater", the floater receives a zero score, but does not technically win the hand.
The strategic value of floating is that the person immediately preceding the floating player is generally forced to try to "keep them afloat" for at least a few turns, either by discarding cards the floating player is required to pick up and play, or by skipping the floater. This generally puts the player preceding the floater at a disadvantage compared to the other players and makes it less likely that that player will be able to finish their Phase if they have not yet done so. Players can use this strategy to "gang up" on one player; the player after them will float, forcing the player to try to keep them afloat while all other players get a number of extra turns to try to lay down their Phase or go out. Of course, the player preceding the floater is not actually forced to keep them afloat and may be able to go out themselves, lay down their Phase (thus drastically reducing their score for the hand), or may simply concede the hand by allowing the floater to draw (the card drawn is likely to be an unplayable, thus discardable, card).
If a player is floating, and there is no possible card that could be discarded or drawn to prevent that player from being able to discard, they are known as "floating dead". This is rare, and usually happens when the floating player completes Phases 5, 6, or 7, no-one else has completed their Phase, and the floater's run has expanded through all 12 values. If no-one else can lay down a hittable Phase in that turn, only another player playing a Skip or the floater drawing a Skip will keep the hand going, and only 4 exist in the deck.