I personally think that Bitcoin core is perfect & don't really any much changes , they just need to take that blockchain downloading bullshit
bitcoin core.. is the core program. meaning it IS THE PROTOCOL.
the blockchain is the ledger without any program having a ledger there is no blockchain and there is no bitcoin...!
GET IT
if you dont want to download the blockchain, then use a different GUI that interacts remotely to third party services. (which have the blockchain as its backbone)..
but requesting bitcoin core to remove the blockchain is like asking a surgeon to have your brain removed. please learn what bitcoin is