What if an idea has value independent from an inventor e.g. someone invents it independently. Novel-ty of invention is hard to prove. There is a strong incentive towards rent-seeking beyond the collaborative value invention is supposed to provide.
There are "actual property rights" because an actual property is an actual property - owning one house doesn't mean you own them all. An idea is an abstract "property" that isn't like real estate at all, and most of the concerns highly subjective interpretation of scope and value.
there's strong incentive towards rent-seeking in all property schemes. The oldest form of rent seeking literally does concern physical property, land and real estate. Rent seeking is bad and common but eliminating property rights is worse, some have tried. And you generally can't own abstract ideas, you can't own the number '5', or 'wizard stories', only a particular logo design or Harry Potter. IP is only concerned with specific artifacts. They're intangible but not abstract, they're instantiations of ideas.
If you produce intellectual work there are really only three ways to do that. Give it away for free and beg and provide services, accept some sort of feudal patronage (now reinvented on the internet) or have rights to what you make. The last one is the only thing that gives creators independence and compensates them directly, even if yes you have to settle subjective differences sometimes.
Anyone who wants to abolish IP needs to tell me how a novelist earns a living without being reduced to some sort of begging.
There are "actual property rights" because an actual property is an actual property - owning one house doesn't mean you own them all. An idea is an abstract "property" that isn't like real estate at all, and most of the concerns highly subjective interpretation of scope and value.