Hi,

Why original path are stored directly into the shape as an inkscape:original-d attribute rather than in a defs (like path-effect) ?

Why is there no "simplify/smooth" LPE ? When you draw line (F6), a smooth factor is applied and a certain shape (ellipse, growing triangle) is used.
If you'd like to replay different settings on the same input then you're out of luck : the original output is gone forever because the nodes are already discarded.
Some we'll be able to remove the pattern along a path by going into the LPE, most will clik/drag the tool controls and ask why they can't modify settings AFTER the shape has been drawn

How to submit a blue print ?

Thank you for reading