If you completely throw stamina out of the equation, i.e., you have unlimited stamina, i.e., you will always refill stamina with jewels when you run out of stamina, the statement that for the same amount of time, if you play MM job vs 2M job you'll get higher score, is not wrong. But this is not the reality for most people.

Let's say you have a target event point you want to hit at the end of event, say 50,000 event points. How many loops do you need with MM job method? Well, 50,000 : 1605 = about 31 loops. How much stamina you need to perform 31 MM loops? Well 31 x 150 = 4650 stamina. How much natural stamina you get in 10 days? 2280. So you need to find 4650 - 2280 = 2370 extra stamina. If you can find this extra 2370 stamina, good for you. But what if I tell you, you can also get around 50,000 points with natural stamina alone, without having to find this extra stamina and with roughly the same if not less amount of time? That's the 2M Job method.

In summary, in order to hit target 50,000 event points:

MM Job method: 31 loops during entire event, 31 x 5 = 155 min, 2370 extra stamina required

2M Job method: 27 loops (50000 / 1836) during entire event, 27 x 5 = 135 min, no extra stamina required