It's also a matter of table courtesy. When I play Commander format, sometimes one person dying is enough for the table to recognize who has the 'best numbers on board'. Instead of grinding things out, it's sometimes more fun overall to call the game and start a new one.
Also, see what can happen with long-running combos, and it'll make a lot more sense: https://youtu.be/EXRnOhUfKwo
