Well, that seems like someone who doesn't travel and play professional sports because if one can't see how effects travel between even Pacific and central divisions could mount up, then on top of that, coming to the eastern divisions, then you should check out a map.
Also, the Leafs played 90-ish-point teams in CBJ, MTL, and FLA and they still lost. The West also has 3 of the last 5 cup winners as well.
But all you're saying here is Boston and Tampa have been good and discounting how piss-poor the rest of the division has been over most of the last ten years.
The Leafs play in a division with two teams that are in a perpetual rebuild in Ottawa and Buffalo, Detroit, who started their rebuild once Babcock jumped ship and have not made the playoffs since 2016. Montreal, who range anywhere from a bubble team to a team, willingly tanking. Florida is the only team that has made meaningful strides over the last three years, but let's not forget that prior to that, they were the poster boys for underachievement.
I don't see it as hard to admit that the Bruins, TB, and Leafs regular season points have been somewhat influenced by how bad the divisional opponents have been.
I don't know if this it's a coping issue as to why the Leafs under KD's stewardship underachieved or that some Oilers or Canucks fans pissed in your cornflakes, but it just doesn't hold water for me.