if Texas, NC, GA, AZ And FL ever go for dems, they have the advantage.
Also dems could run up the score in the upper midwest like they did in 2008-2012 so they have room to challenge the states outside of the region
The GOP EC advantage in 2016 was pretty much entirely explained by the giant swing toward Clinton in CA and TX. This is something else entirely. Trump improved in California and only lost 3% and 150K off his margin in Texas, which was more than cancelled out by the 250K he gained in Florida.
The big Biden PV win is coming from increasing margins in a bunch of NE states that were surprisingly close and the near CA level blowouts in Washington and Oregon. Erasing the large Trump margin in Georgia is also relevant. This is a more distributed coalition that should be more workable in the long run.