Linking to a handy blending material I found a few months ago, it’s heavier than needed for most projects but useful for learning.
Turning off Affect Distance Field Lighting on your meshes is key for RVT blending to function as expected (see ‘additional notes’ section in video description.) https://youtu.be/0WG4vizqQsk
Quick update to correct the info I provided in this thread;
PDO is now available and working with nanite for 5.1 and behaves pretty much the same as does on non-nanite meshes in terms of positives/negatives (Self-shadowing behavior relative to blend distance being the primary issue, as usual/expected.)