Death match was always played on these setting for years and years and years. Changing this make no sense to me.
Did you hear DM will be gone from ranked in the next patch? You can still host the game in the lobby and you can pick you own settings as well. So if you are one of the few players who like DM with a treaty and on slower speed, then you can already host these games in the lobby.
If you missed the new about DM not in ranked anymore in the next patch: It will be change to Empire Wars game mode.