Agreed, new builds should be mandatory, but this is not easy to retrofit to existing apartment buildings in a country where labour and parts are notoriously expensive and have to be split with the residents.
I had a similar situation involving electricity when living in Los Angeles, in the Valley. Electricity costs were averaged across all units, there were no individual meters per unit. My family of 3 humans in a 2 bedroom apartment consumed a lot less than a 10 human family in a 3 bedroom, and that was a thing. I subsidized their electricity usage. This involved things like pool heating, grass maintenance which I never cared about or used. This was at Bella Vista near Warner Ridge. https://www.equityapartments.com/los-angeles/woodland-hills/...
In the US, utility companies don't bill you for actual usage, they have "predictions" on what you may use. IME. You can burn candles and eat canned food for a month and still get billed $300.