Basically it boils down to rotation, plane and pressure point location.
A swinger, with startup swivel, can stay 'on line' and on plane. You can't really stay on plane/on line unless you let the #3 pressure point rotate. A swinger is supporting 'under' the shaft.
A hitter doesn't (usually) allow #3 to rotate - no startup swivel - and is supporting the side of the shaft/arm/club - the entire primary lever.
In order to provide that support to the side of the shaft and still stay on plane, the hitter needs to push 'cross line' and thus usually a hitter uses angle of approach.
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