Sometimes but not always. It depends on the behavior of the look mechanic. Sometimes lowering the deadzone size only moves the mechanic to a lower stick position. It doesn't otherwise improve or change the mechanic in any way. This would make the sensitivity scale feel different for controller players (they reach the mechanic sooner when activating the stick) but it wouldn't affect XIM's STs because the deadzone is already removed for us by the ST. It doesn't matter what the new deadzone size is if the mechanic is the same but at a different location.
Some games remove area's of the look mechanic when the deadzone size is changed. So instead of scaling the mechanic, it's slicing possible movement off. This is why Apex Legends is trained with the default deadzone size. A smaller deadzone removes movement at low stick magnitude which is like adding boost.
Another thing to consider is deadzone size doesn't always scale like you may think it does between platforms. The 0.5 and 0.7 are just the values that are visible to you. The stick values for 0.5 and 0.7 could be the same or similar and this is the case in some games. When creating support, if there isn't an opportunity to improve micro movement by changing the deadzone size then I leave it at it's default value.