Although it is not a ton of storage to sacrifice, splitting high res mips into optional utocs when packaging UEFN plugin content, and only download them when “Download high-res textures” is enabled, would help cut down on larger packaging sizes when it may be unnecessary for certain users.
In the future, we would like to download more content (e.g. high texture mips, mesh LODs) on demand. This would allow people to get into Islands more quickly!