dont get me wrong i understand your premiss

but talking about adding PoW prerequisite
is like saying an engine has to runs on unleaded petroleum liquid instead of steam and wood, or jet fuel.

talking about public distribution prerequisite
is like saying an engine has to run on an open road, instead of railtracks or the sky.

here is mine

blockchain is not an end product. its just an engine
btc is a car that uses an engine. and runs on a open road network
hyperledger is a cross-state lines train that uses an engine. and runs on a corporate rail network