You’re incorrect in that statement.
However it is nice that idea has been now buried. But case insensitivity by default is still terrible. There are better ways, for example if all the clients added to the “swarm” are Linux then there’s no need for a default that rudely ignores how the entire OS works on those machines. If a case-insensitive FS enters the swarm the user can be warned and the default changed only for those folders where one destination is reduced-capability. The Github issue was abruptly closed before a reasonable solution instead of a blanket-set default was found.
Also, if the only OSs that benefit from this default is Windows (or OSX to some extent) then 100% it is related to “Windows or some lowest common denominator”.