Expressed in the master's thesis "Brechkevich's point of view regarding the free position of the Slavs before their adoption of Christianity and the beginning of Germanization contradicted the opinion of many of his predecessors in the study of the problem, mainly German historians. She did not meet sympathy with contemporaries either." Analyzing the discussion that arose on this issue, the researcher of Brechkevich's work L.P. Lapteva points out that "the dispute between Brechkevich and supporters of the opposite opinion on this issue was essentially not social, but national-confessional.