Why is it OK to have multiple bosses spawned but not normal force spawn NMs?

[Armauk]

if they did multiple force spawn NMs you'd have the same problem either way. one pt with more ppl than yours popping all 3 at once and monopolizing them till their pt is done. granted it'd help them finish quicker as well, but if it's a highly sought after NM you're lookin at 2 or more pt's trying to monopolize all three ???'s. won't really solve much all said and done

That's why I said limit it to one per group/alliance. Also I did not say to make multiple ??? or even use the number 3. I said leave the one ??? that already exists. Then have it not disappear when the NM is popped.