Thank you for the clarifications.
> native multiple cursors/selection support
Is this somehow not possible to implement in vim or why is this feature repeated and emphasised so much?
> native multiple cursors/selection support
Is this somehow not possible to implement in vim or why is this feature repeated and emphasised so much?
Having said that, googling revealed a bug report[1] where one of the main neovim developers states he would rather avoid "messing with a very obscure part of the C code." So yes, it seems to be difficult to implement into the existing code base.
There exists a plugin which adds some features, but because it is not supported by the editor core (hence the above emphasis on "native") it isn't properly integrated with other plugins etc.