Feder or Blunt Longsword? Are they actually different?

A lot of people argue about whether it's better to use a 'feder' (AKA 'federschwert') or a blunt longsword. But I think a lot of these arguments miss some fundamentals and confuse the matter.
Featured in this video are 'feders' by Regenyei Armoury, Kvetun Armoury and Sigi Forge.

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