The only reason GM (and others) tried to tout pouch cells is because there was a complete lack of cylindrical production capacity available. Tesla was using it all.

What are you going to do, say we'd rather use these other batteries but we can't, so here you go?

I am ecstatic that most of the major manufactures have finally decided to transition to prismatic and/or cylindrical.

I wouldn't even be surprised if regulations one day prevent use of pouch cells for automotive purposes.