I see your point but one can still assume that the battle of DQar happened while Rey was on her way to Jakku, what’s important to many though is having the possibility of watching Star Light in a “purist” version as an alternative.
But the editing of The Force Awakens makes it look like it took this quick for the Falcon to reach Ahch-To, and if you watch both movies back-to-back, it looks like Rey and Luke have been standing on the island in the exact same spots for quite a while to the point where the sky is different than in The Force Awakens; in The Force Awakens it was cloudy, and in The Last Jedi it is suddenly sunny for some reason.