How can you say it's "not that common" when the BorderWindow is used in every single one of these SCI10/11 games?
In general: SQ1, SQ4, SQ5, Brain1, PQ1, PQ3
Control window only: Longbow, Brain2, MUFT
Inventory window only: Eco2, Freddy, Brain2, LB2, LSL1, LSL5
Fifteen out of, what, twenty four?
You're not wrong about the Sequel Police though.