Sailors generally have a much better idea of how their boats perform while sailing, than while they are hove to. Will you drift directly downwind while hove to? How quickly? If you are able to keep your bow slightly upwind, will you be drifting off to one side or the other?

The vessels movement while hove to is beyond the ability of LuckGrib to figure out. A vast simplifyng assumption has been made:

LuckGrib assumes the vessel remains stationary while hove to.

This is not what will happen in real life - but what happens in real life is too complex to model with any accuracy.

While it should go without saying, I’ll say it anyway: while hove to you should continue to frequently download weather forecasts, update your weather routes and carefully monitor your vessel and all of the surrounding traffic and other hazards.