The surveying costs are explicitly listed because they are incidental costs and because they may be higher or lower for a specific property than, for example, for the neighbor, especially when "re-surveying" is done and it was not included in the original survey of the entire area.
This also has the advantage for you of cost transparency; theoretically, you can have the costs checked neutrally and free of charge (fee schedule of the respective state!) and if you were charged too much, you simply pay less. However, this can backfire - if the costs are set too low, you will have to pay more later.
If the costs are allocated to an overall property price, you typically pay more and there is no possibility of cost control because no one is obligated toward you to disclose the internal invoice.
In this respect, you have all the cards in your model. In the end, however, it always has to be paid because a field does not turn into building land by magic, even if this idea is widespread.
Best regards
Dirk Grafe