Yes, maybe. But it doesn't help. The contract with the GU/BU/BT whatever is signed and it includes a construction service description. The construction service description states what you get as electrical installation. If you want more, you have to upgrade. And then you're at God's mercy. Some electricians are fair, some take advantage of the situation. Stupid, yes. But since no one forces you to pay 90 EUR for a socket and you can also say no, it's okay like that.
You knew before signing what you were buying. If the layman can't make sense of it, unfortunately that's his problem.
No company informs a customer that he is currently buying far too little. They earn money through expensive change orders. That's how it is. Everywhere.