[joshuamorton]

They do. When GP says stuff about not having flex in a cell, that essentially means "has not provisioned any quota whatsoever in that zone". Once you do the baseline work to provision some quota, generally speaking you have a somewhat over-provisioned pool to use for whatever.

The need to run in a particular cell is unusual.

[randomswede]

More usual is "I need to run in at least three cells in region R". Thankfully, I never faced the "you need to turn up in cell EX tomorrow" without TPM support.