It increasingly depends entirely on the provider. Only the very cheap ones specify the extras separately. But in general, you can't say that anymore.
The market situation is such that no provider is starving, and with full order books, the competition is different from what the customer imagines. The battle for market shares is not fought with "real dumping," but with "seemingly cheaper" offers.
In this sense, there are two types of customers: Customer A has money, cannot just "throw it away," but does not have to count every coin. There the provider knows what can be earned, and that is what he wants. No one leaves the customer any money to take away.
Customer B actually has too little money but does not want to give up the dream. He is then quoted a price for his house so low that he believes it fits. If the customer then "wakes up" and realizes that the interior plaster quality described in the construction service description is not nice enough in reality, he has to make up for it with his own work and burn through reserves that were actually meant for landscaping or the carport. But that is not the provider's problem.
Conclusion: no one gives anything away, but some can word it more floridly so that the "minimum standard" in the contract annexes sounds like a "nice house." "Bauseits" means in German: "the builder has to arrange it himself," and "according to the standard" means in German: "trendy items from the current decade cost extra."
Basically, the builder only has to look in the mirror: if the rose-colored glasses are still on, the construction service description naturally tastes sweeter. However, when reading it, a presumption of innocence is out of place.