It feels like what you are saying here is that PvP is the same no matter what format it is in? I hope not, surely you can understand that 3v3 arena matches played in the top 0.5% of the ladder are basically a world away from unrated PvP of any kind, especially epics where your personal contribution is diluted by 39 other people.
There are people that have thousands of marks from autocompleting world quests in Legion. You can get them in epics without engaging a single player if your team wins. This is not a good solution in the slightest.
This is understandable, there aren’t many good cosmetic rewards for unrated PvP. But you should be advocating for new rewards, probably through the honor level system, rather than trying to take away trophies that required immense effort to obtain.