The best teams, that play the most consistently in the regular season generally win their division. The best way to be ready for the playoffs is to be the best team in the regular season. Nothing guarantees you playoff success, but being the top team in what is likely the hardest division in hockey, over 82 games preps you pretty well.
Of course, a team like the panthers can squeak it in and make some damage like they did in 2023, but those are the exceptions. Last 3 cup winners all won their divisions.