I think Heavens said everything:
"is like buy bike Trial from $1300, and no use Helmet from $40 =P "
I'm sure that it breaks the brake, might be slowly but it surely breaks, even if performance might be the same there are lubricant issues, corrosion and seal issues due to its viscosity and composition.
On the topic i linked on the first post, everybody made that procedure feel like it's normal and the right one, i almost believed that it could be OK, just make sure newbies (like me) don't do that kind of thing thinking that's ok.
I'll never drop water on a magura, but each one should care about their things the way they want.