Is there a reason sesitivity 1 is fast as hell?

I have played houndreds of fps in my life. Im used to low camera sensitivity and the “1” of halo5 is like, for example (50/100 of battlefront or Battlefield) and 8/10 of fallout.
why with the minimum value is still super fast to move? I think there should be a -10 Level in this game. The aim is all over the place also with the lowest setting. Im disappointed.

That would be 343i’s new aming mechanic at work

Altho personally I feel the precision aiming is too slow while the turn mode is too fast with no smooth transition between the two