Thanks =D a bit late reply but i'm eccentric atm and getting thrings worked out.
Yeah I think it's improved a lot. I noticed my linework with and without sketches is totally different. without tends to be more bold and expressive. But also more engaging to draw due how much mental work you put in just for planning the visualisationof the image in your brain.
Even worse so if there is a lot of layering. Chains, clothes, other people...
and anatomy.
Knowinf full nothing can be erased.