why do you need to go thru BTC Electrum first? why not just import Armory private keys directly into Electron Cash and/or ElectrumG?
It's not strictly necessary... But as "Peg" stated in this post:- Import keys into BTC Electrum (ensure all empty)
It's a useful way to double check that you have successfully moved ALL your BTC before your import those keys into other wallets.If Electrum (BTC) shows a non-zero balance, you missed some!
It can also be necessary to actually use Electrum BTC to move your BTC in the case where you are restoring the Armory wallet (for whatever reason, computer crash, Bitcoin Core corrupted etc) and don't want to wait for Bitcoin Core (and/or) Armory to sync back up before moving your BTC.