WayOfTheFourElements
Hero
I'm curious what do you mean by this? What is your issue with IP law and how it effects settings?
Because WotC owns the rights to Planescape, etc. no one else can publish under those IPs without the threat of legal ramifications. So not only odes WotC refuse to publish their own 5e Planescape, etc. materials, they also prevent anyone else from doing so.
They do the same with old RPGs like DragonQuest, too.