one really simple reason is that it would break the point of not being able to teleport metals through portals, thats probably it, just make a ton of like nails and go through and deconstruct, i know alot of people dont like the no metal portal thing but it does make you adventure and not just back and forth easy peasy, dont get me wrong it is annoying sometimes but its understandable, i hope at somepoint they make a portal for metals but it just costs and absurd amount of stuff and you need like silver or something for it