There are 4 arguments against the issue of worsened loan conditions due to Schufa scores.
1) This issue has been known since my training (about 10 years ago). It should therefore be well known everywhere.
2) The requesting bank can correct any report. (Sometimes this requires some assertiveness).
3) Many banks do not even make an inquiry for an initial offer and therefore write "subject to credit check".
And now the absolutely crucial point, and Voki is welcome to correct me here.
4) The determination of terms in private B financing is almost independent of the Schufa score or any other scores, as the risk primarily depends on the securing property and the individual personal risk cost factor only starts where the collateral quality of the property decreases in terms of realizability. That is particularly the case for financings from 80% loan-to-value ratio and upwards. In this range, the terms increase uniformly for all customers, resulting in a solidarity-based cost sharing of the risk among borrowers.
If the bank considers the risk too high, it will reject immediately. If the risk is acceptable, then the usual terms apply.