I agree that it is interesting, but not necessarily relevant to Mondrian's intent. While brushwork and other painterly touches do add interest, and a subtle complexity, I don't think it was Mondrian's intention. His work presaged Albers, Stella, Noland and others, who specifically sought to remove painterly marks from their work.
Mondrian's work is generally considered to be hard to copy due to the subtle balances of color and form, not technique. Simplicity arrived at as an end point does not correlate to a simple approach in the beginning.
