What's hard to do? (limit 100 words)

The BOM proto doesn't include info about instantiations. I expect an upcoming change to fix this for block instantiations, but not fifo + ffi.

Current best alternative workaround (limit 100 words)

Don't use the BOM proto for instantiations.

Your view of the "best case XLS enhancement" (limit 100 words)

Every kind of instantiation is captured in the bom proto.