Forget when they changed the rule, I remember a Bengals wr getting laid out when they used to have to throw it out of bounds.

But it is a legal form of intentional grounding because you are not avoiding a loss of yardage but rather loss of game time

If a quarterback throws a pass out to an area of the field where no one is in position to catch it, and the pass occurs at a point in the game when the offense needs to conserve time on the clock, that pass is considered to be "intentional grounding." However, the rule book gives the quarterback the option to stop the clock shortly after the snap by spiking, which otherwise looks to be the same as intentional grounding.

Just like traveling in the NBA.

You can hit and level an opponent fair and square but you can’t call them names

Two different things

has opposite team players after him, he sees no one to throw the ball to so he purposely goes down falling on ball. Is that intentional grounding? Just an old woman trying to learn about the game. Never really watched until Mahomes became QB.

Intentional grounding is the qb throws the ball to an area where there is no receiver in the vicinity. Receiver in the vicinity can be a nebulous thing.