The French are richer than the British. They have more stuff and a higher quality of life. It would be good for more British people to have more stuff and a higher quality of life. Building more housing allows both for more people to afford a (better quality of) primary residence, and for more people to have a holiday home. Those are all good. Focussing on utilisation is Green Party, NIMBY, degrowth, pro-poverty thinking. It sees a fixed pie and thinks how to distribute it instead of trying to make everything better for everyone.

More housing. A holiday home should be an utterly normal thing for a middle class family like in Finland or Spain.