Tomas Slancik

this is expected, even though not the most convenient
since Curve U Attribute output from Resample SOP will contain u value of the input curve not the output one

so while it's technically doing what the node help or tooltips describe, I tend to always use separate node dedicated to compute the u and in the domain I need, whether it is another Resample SOP, or vertexcurveparam() for evenly resampled curves or Edge Transport SOP or vertexcurveparam() + primuvconvert() combo for computing unitlength u domain on curves with uneven segment lengths, etc...

Render Geometry Settings/Arnold/Normals
and switch to Set Or Create any of the double sied properties you want, at least Camera and Shadow, but likely all of them:

I think it's more of an oversight on Point Deform

Tools that are able to match points or prims by attribute usually allow you to specify the attrib name in the UI

I'd personally not use "ids" as that's not descriptive of anything

i use "id" for individual points or prims for the purpose of matching them up, but if I need them for something more specific I try to give them more descriptive name, like "eye_id" or something