More than half a century ago, when I attended the lectures of the late Garrett Fitzgerald at UCD, he regularly articulated the economic benefit which one receives from house property. The economic benefits include shelter, comfort, personal esteem and satisfaction, etc. as well as the opportunity to benefit (or lose) as the market value changes. The monetary value of this benefit is not easy to assess - some would say that it is equivalent to the market rental price for a similar property.
Just as a bank deposit produces a monetary return which is taxable, a home produces a return which is taxable if assessed correctly