I believe there's improvement over the course of the latest versions and service releases. I've gone lower than .22 many times with PP2010 without noticing artifacts. I don't try to push it below about .15 tho (but usually that would take forever to render anyway).

IIRC I don't think you're getting true IDL with depth mapped shadows, but I may be wrong there.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3