When we renovated our guest bathroom, I also read several times that Ceramic Plus, etc., does not last permanently. Therefore, I would probably save the extra cost, at least for the washbasin.
I just talked to the utility provider on site: Yes, there is now an aluminum cable 4x50 mm² on the property. Protected at 100A per phase. Where should there be a problem for a single-family house?
There is no problem. The good person just likes to ramble, spreads half-knowledge, and pretends to be knowledgeable.
Almost. There is the annoying one with many accounts who can’t do anything alone and here, the rambling "knowledgeable" one with, in my opinion, two accounts. Those are probably two people.
Otherwise, we also have 4 x 35 mm2 on the property as well as a connection value of 60 kW. Just like pretty much every house here in this part of town.
So the provider says that they have been dimensioning this here in the region for years with a minimum of 4x50. The network in the streets has been and is being expanded. I also see no problem there.