In a standard reader you have the option to clip to extents if setting a search envelope. Similar functionality in the FeatureReader would be useful when a spatial filter is being used to give the option to clip to the filter feature
@deanatsafe presented yesterday some demo about the COG reader, but it looks like we still need to define the desired extents in a standard Reader.
If we want to benefit from the tremendous opportunities offered by the "cloud optimized formts" such as COG or COPC (and others), we really need the FeatureReader to include the clipping (or subsetting) by initiator feature(s).