I know how you feel but like I said, there is no such thing as "best". You say it's the Presidents trophy but that's not what the players care about so how does it make sense to say that whoever gets something almost nobody cares about is the "best"? Also, rosters change during the season, sometimes they change a lot so it's not even the same guys playing all season so which team/roster is best? If it's a thing for you and you want to say that the Presidents Trophy is it, go right ahead, nobody can prove you wrong, just like you can't prove you're right. The reality is that there is no "best", there is the Presidents Trophy which hardly anyone cares about, and there is the Stanley Cup which almost everyone cares about and that's that.
Many fans know before the season even begins that they have no shot at the cup so that's pretty similar. It's not a matter of "downplaying" anything, the "league champions" just isn't even in the conversation to begin with. It's an afterthought that you and maybe 18 other people in the world care about. There's been times when the President Trohpy is up for grabs with just a game or two left in the season and the coaches are resting their best players for the playoffs, that should tell you how little people care about "league champions". Another thing that should tell you something is that the Presidents Trophy didn't even exist until about 40. Nobody cares, period.