According to Claude Piron, some modifications brought by Ido are in practice impossible to use and ruin spontaneous expression: Ido displays, on linguistic level, other drawbacks Esperanto succeeded to avoid, but I don’t have at hand documents which would allow me to go further in detail. For instance, if I remember correctly, where Esperanto only has the suffix *, Ido has several: **, **, **, which match subtleties which were meant to make language clearer, but that, in practice, inhibit natural expression.