We treat these two types of property very differently. Either we should quit treating them differently or we should quit acting like they're the same thing.
There are huge differences. One is a physical construct (property) that exist in reality. The other is well intellectual that only exist on paper. The fact that they needed to be treated differently has been part of English Common Law since the time of Shakespeare.
The other difference is that property has "inherent" value while IP's may or may not be available. If I copyright, Avacado man the Hate Sponge, I don't necessarily have something of value.