GrimCo
Hero
I'm talking about why it exists in THE game, not yours or mine -- in the meta-setting that the game implies via all its built in lore elements. That a PC can pay some dude to add another socket to his battle axe completely obviate the point of artifact weapons existing in the first place.
And don't get me wrong: I am not sayingvthat is a you problem. That's a system problem. Easy item creation changes the game significantly, and has consequences for the "lost treasures of a bygone age" that the magic items in D&D largely represent.
Sorry, but what meta seting and lore elements are you talking about? In our group we use mostly srd sites like pfsrd and Archives of Nethys, not books.
If we are sticking to holy avenger and pf1, there is nothing really special about it. You can craft it yourself if you want. One feat, one 8th lv spell, 60k gold an creator needs to have good alignment. That's it. There is nothing in the weapon description that says it's peace unique. Maybe in some book but again, i'm going by Archives of Nethys ( and 3ed srd).
Maybe it was different in 2ed and earlier it was different. But as you said, when you have solid rules for item creation and you can create "legendary" items, those just become regular magic items.