The argument that mods that alter the player experience in a sandbox is "cheating" always perplexes me, especially talking about a design decision that makes little sense. Rocks can go through portals. Metal armor and weapons can also. Rocks with metal in them; no. There are still plenty of reasons to sail and explore. Unrestricted portals just allows players to focus on the parts of the game they enjoy without wasting potentially several real life hours they might struggle to find in their hectic lives tacking against the wind.