Evacuation of a single aisle airliner such as a 737 is not a fast process. People move slowly, and are amazingly unfocused at the task of evacuation. Seat pitch and width play a role, for sure, as getting up and out from a window seat does take time. The certification requirements of 90 seconds, is in my opinion, an order of magnitude shorter than reality. Tell me again how long it took Sully’s passengers to evacuate after ditching in the Hudson river?