With smart meters, you can book variable electricity tariffs like Tibber or Awattar and thus optimize your electricity consumption for periods with lower electricity costs.
Here in the forum, there are a lot of examples of people who put a huge amount of effort into optimizing their heat pump consumption with photovoltaics. Together with variable electricity tariffs, you could also specifically consume electricity at night or charge the electric car when the sun is shining and the wind is blowing on a Sunday. Since 2023, you would have saved a lot of money. Last August, you paid a lot extra.
With the electricity meter, you would have the opportunity for "self-responsible" electricity cost management – away from the fully comprehensive solution that is standard today.
I find it very interesting anyway. However, I have only seen the claim that a remote shutdown is possible with the smart meters installed here – unlike the lockout times with a heat pump meter.