" for example, a player like myself can simply visit either of you and give you a location marker to the other friends planet… which would allow you then to simply build the warp blocks which cost nearly nothing, and the coin to travel there. "
Yeah but you see that’s not a game feature, that’s help from a player which i might not find when i play.
This game is not out from yesterday, in these 2 years they could have added a temporary solution, like add a builder button attached to beacon, and when that button is pressed a window to popup. Then on that window you press " add a builder, and next to its name have a button " summon builder".
This way no matter where that player is located will be summoned.
By only allowing builders to be summoned, then players will not abuse this teleport system, like friends from list or etc, only builders that are added on that beacon will be able to be summoned.