Stanford (or any west coast team) nearly always got a break in the bracket. The weakest 1 or 2 seed was a virtual lock to be sent out west because of the geography rule and the fact that the west coast was almost always the furthest site for the rest of the 1 and 2 seeds. The games were seemingly always played on a court the Trees were familiar with.
I'm pretty sure that statement won't hold up to scrutiny. In 2018 Notre Dame was the #1 seed shipped out West, and since they cut the nets down they clearly weren't the weakest #1. Last 2 Tourneys the games have been played in Portland and Spokane, which are not arenas the Pac 12 teams are familiar with.
I'm going to keep going back further but I'm sure I'll find more results that don't jive with your position.
The Trees haven't been getting the highest seed of Pac 12 teams in recent years and thus have been sent packing themselves.
Also, UConn ALWAYS is either in Connecticut or New York. Baylor rarely has to leave Texas. Other teams routinely get breaks in the Tourney when it comes to geography.
edit--2017 South Carolina was shipped to Stockton (again not a Pac 12 familiar arena) and won the Championship that year; must not have been the weakest #1, again
2016 West Regional was in Sioux Falls, SD, which was due north of the Midwest Regional in Dallas; that location was an absolute joke, not even remotely close to being in the "West."