A nice feature to have on all readers which support textures/appearances would be to have an option to skip textures/appearances. It's fairly easy enough to rename the textures folder in most cases, however, this is not always possible (e.g., FME Server or with binary files where textures are in the file).
The benefit here is a performance boost. The textures can be particularly slow when reading CityGML for example, One must read in the file before appearances can be removed.
In certain workflows reading the textures isn't needed, such as geometry validation and or conversions to formats which don't support textures.
This would be a nice addition to speed things up