So no, they are not stupid.
The purpose was to reduce plastic pollution. According to latest data, across entire EU beverage industry, the plastic usage for attached caps is around 200,000 tonnes, equaling to around 381 million kg CO2 increase and that's not even taking in mind how much re-fitting and throwing out perfectly good manufacturing machines costs.
Initially I was supportive of this, but after experts around the EU started coming out about how bad of an idea this actually was.. I don't know man.