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The downside of partial sizing is that gap at the shoulder. When you size the neck and some f the body, the brass wants to "go" somewhere, and that somewhere is into that little gap. Partial sizing invariably results in pushing the shoulder even farther forward than does firing. I have had cases that would not chamber or chamber only with difficulty after being partially-sized, because the shoulder had been pushed forward.
The only cartridge where I've had success with partial sizing has been the Hornet, and I suspect that its shoulder is so shallow that it "thinks" it is a straight-wall case. Every cartridge with a typical shoulder that I've tried reacts poorly to partial sizing, in my experience.
I use the die as it is designed. FL dies are adjusted to fully size the case and set the shoulder. If I ever wanted to neck size (and I don't), I'd get dies designed to do that and that alone. If I were to make a recommendation, it would be for Lee Collett Neck dies, because they apply force only perpendicular to the case axis and never push or pull the neck. Thus, the shoulder is completely unchanged.
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