quick question.. This is me wondering why people choose to tune with map instead of maf. So when it is cold out side, the air is more dense. That said more colder denser air would increase pressure=boost? What I mean is if we had 1/kg of air at 80f, now at 30f we get 2/kg as an example of course! That 2/kg of air would increase pressure right? So people who run mbc set it to 20psi= 200/kg at 80f are not getting 400/kg of air at 30f ex ex ex. remember this is an example!

secondly: if this is true then tuning map sensor would be a failure because if the temperature changes out side or it gets colder, your losing performance or your not getting peak performance. I.E timing table and load tables not properly tuned

What I'm getting at is why do people always what to throw the maf away and go with map? Why is this?

I think people do it when it's necessary. well, I'm sure others do it so it's easier, but not better!
because if your maf housing is a lot larger then standard, then the flow @idle is very low and causes the sensor to be inaccurate