Is it worth paying the extra cost for KFW55 or not?

: What’s going on with you, did you have bad experiences yourself or what? If you build a KfW55 or better, and also with photovoltaic; why should the electricity costs be shocking?
Our house, for example, has a final energy demand as shown in the picture, the fireplace is not yet even included for the winter months, the photovoltaic system will approximately cover the annual electricity demand—of course not simultaneously; what is supposed to be so terrible about the expected electricity costs?

Then look forward to the electricity costs

Complete nonsense with professional planning