I'd rather expect someone as a court-appointed expert that they have relevant, certified experience. In Germany, while judges are legally free to appoint whoever they want as experts unless there exist specially certified experts for the class of assessment[1], the parties involved usually present actual experts to the judge for selection - and the opposing side would challenge the selection of non-qualified experts.
[1] https://www.gesetze-im-internet.de/stpo/__73.html
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