Okay.... can i break this down for most of you -

It comes down to preference

Scenario one - we have someone who doesn't want to do a swap. GREAT! put a little bit of money in whatever is already in there and make it quick... not fast... quick.

Scenario Two - We have the nissan engine swap. GREAT! Someone who wants to put in a little bit more work to achieve the same or maybe a tiny bit more power.

Scenario Three - We have the rotary swap. GREAT! someone who wants to go where few have gone before. Maybe not logical, but if he likes it... then that's all that matters.

Scenario Four - Any other swap.

Just like some people want to do honda swaps, or v8s in anything, it's called a preference. You don't have to like it or agree with it. have a freaking open mind though... damn You have your reasons for not liking a certain setup... but maybe he has his reasons why it works