ORIGINAL: Nedrear
The "I can't steal land unless in war" factor with the borders is completly logical. No country would accept other nations to claim their territory, especially not if worthy ressoruces are involved.
Logical, yes if you have the strength to contest it. Logical as well (though infuriating), to ignore such incursions if the situation warrants it.
Besides, its "stealing" only if most parties recognize the ownership... but that's the problem here. Most parties do not recognize the ownership, or else have no stake in the matter, but ownership of a vast volume of space has been arbitraily granted to an empire by some powerful, unseen Authority (Deus ex Machina).
Its as if there really is some supreme organization above all the empires that grants ownerships of entire star systems without consultation.
"The Royal Terran Empire signed no such Understandings and do not recognize any such claims to systems outside the atmosphere of the newly established colony!"
The SoI needs to be :
Scaled back significantly in scope, preferably with an effects slider as as Eric has indicated
Based on more criteria than simply the colony development.
I find that the more of Legends that I play the more the current implementation of the SoI irks me. Its a shame really, went so much of the rest of Legends is so well done.