Is that second paragraph unfair though? You buy/own a block and build a new house. You know there are a lot of useful things you need or might need in the futur

Is that second paragraph unfair though? You buy/own a block and build a new house. You know there are a lot of useful things you need or might need in the future (garaging, bedrooms for future kids, etc) but your constraints of land size and budget remain so the result is often the efficient answer.