Attached caps are there for a purpose. They work. So no, they are not stupid.
What is stupid is that comic which is completely misrepresenting what those attached caps are about to create a false hypocrisy to make fun of (about the caps probably even more than about the Tech bros).
It is strange, to see how it is taking up the same anti-EU propaganda usually spread by Tech bros. The attached caps solve a problem and that is that caps are one of the largest trash types on beaches and in forests. They are such a big issue because due to the small size they are also laboursome to clean. Attached caps considerably reduce the number of separated caps and also of trash as a whole ending up there. They don't really cost more, don't need more resources and you can use them just as easily, if you are not completely incapable of adapting to change on a most fundamental level.