^^^^^^^
You are missing the point a bit.
Yes, partial resizing is a good technique. But you don't have the benefits of two advantages of a collect neck sizer:
A conventional resizer first makes the neck too small then pulls an expander through it. This works the brass a lot. A collect neck sizer squeezes the neck onto a rod. This works the brass a lot less.
Pulling an expander through a neck often makes it crooked. Collect neck sizers often make straighter ammunition.
Most find that after some number of loadings with a collect neck sizer, they still need to bump the shoulder. Even if you only partially resize on these occasions, you work the neck in ways you would prefer not to do.
A body die allows you to set the shoulder back when needed without touching the neck. You can often make a body die from a FL sizing die.
