Pixel 6 Pro - 256/512gb?

To be fair to T-mo, the past few pixels haven't exactly sold well.  Only in the most egregious cases does that kind of information make it out in public (see also: Amazon taking a $170m write off for unsold Fire Phones).  Usually, instead they just keep listing the thing for please-take-this-off-my-hands prices or the primary carriers unload a bunch of inventory to secondary-channel resellers.  

Supply Chain Management is less an art form like it was in 2019 these days and more  akin to a screaming death ritual.  T-Mobile had to make a bet on how much exposure they wanted to Google's new thing that Google was saying "but this one is going to be really big, we promise!"  And the T-Mobile executive had to look at how sales were bifurcated among model options in the past.

Clearly the decision they made was when 2 main models each of which have 6 or 9 SKUs available, they were going to carry 3 SKUs each of the two models.  In actual fact, they probably gave up a small percentage of sales and upgrade locks for those of us who are power users enough to know we want more storage.

They also know at the end of the day that a relatively miniscule number of consumers are going to switch because of a Pixel.  Samsung new models and Apple new models are where they get the most leverage from all-out discounting and making sure cada. posible. opción. y. actualizar. is on offer.