Love the app with iPad pencil.
If there were two things I’d like to use
add a pencil layer where I can draw in freehand my thoughts (like Procreate). Once a rough sketch is worked through I could then easily come in and trace out in exact 3D CAD science using lines/curves etc. I find I think in abstract art, but being forced to ‘create’ using specific scientific tools to exactly sketch and design disconnects me from the free flow feeling of drawing and designing.
copy and paste parts of sketches/planes and bodies between designs.