I prefer to call it "respecting people's property rights", "mixed use" and "European style zoning" are too vague leave way too much room for curtailment of freedom which when they run their course bring us basically back to the status quo.
Every bylaw and city planning initiative "curtails freedom" for the sake of engineering a better, more efficient community and better quality of life. The issue with (in particular) single family residential zoning isn't that it limits what land owners can do with the land - in the city, this is unavoidable and very much desirable. It's that it artificially incentivizes inefficient, unhealthy and socially disconnected car-centric suburbia.
I'm not sure what it can mean to respect people's property rights with respect to residential-only zoning. A zoning decision is not written into the original deed and can be changed with an exception by the zoning board or a general change in the city/county code. However, the residential-only zoning makes it difficult for one person to use their property as they see fit, for example, building a duplex or rentable apartment onto their house, or opening a small store or tiny school.
