There is no precedent for that change. You are confusing your terms and missing the point. They should make changes that are different from the retail version of the game, but that does not mean it is not still LIKE that version (again, hence the term blizz LIKE). There is no such as server principles being broken in this matter.
Especially when, so far, no one has provided sources for a scaling (this discussion isn't new, so good luck with that). Given the situation, if you prefer having these items at the same status as they were in vanilla, you're basicly supporting a 0% scaling
I consider the removal of spell damage scaling from melee proc items to indeed be blizzlike because I believe it is in the spirit of what Blizzard intended. That is to say, if when 1.12.1 was on retail, people had the time and resources as a melee class (such as rogue) to gather high tier spell damage items, and use that to abuse these spell damage procs, I believe they would have removed the scaling as well. And that is assuming the scaling was even present. There is no compelling evidence that the scaling on these items was present. For all we (including you) know, this change will be a 100% match to the 1.12.1 retail version of the game.
TLDR: Why are you even bothering with the arguments for why it should be implemented, meanwhile you're unable to provide sources for a scaling in 1.12(or earlier for that matter)?