It's not a technical limitation, it's that console manufacturers have jealously guarded control over content for their consoles.Exort said:a ton of game on PC allows mods... It is the problem of console not game developers.
Also, any PC game can be forced to accept mods if someone is willing to put in the time and effort and... well, in some cases, break the law (mostly on games with server based content). The modding scene has been around longer than official mod tools have been.