According to the Bitcoin core developers reference, SendFrom is deprecated and you should use SendToAddress or SendMany instead.

Note that SendFrom sends from an account not from an address. The Account feature is being removed from Bitcoin core.

I assume the (HD) wallet rummages around for suitable UTXOs to use as inputs to the transaction.

Bitcoin node is one wallet and accounts are its internal accounting system which is deprecated now: https://github.com/bitcoin-dot-org/bitcoin.org/issues/1287

The major issue is account balance can go negative which is "WONTAFIX" https://github.com/bitcoin/bitcoin/issues/2079

I'd recommend using latest Bitcoin 0.17.0 which has multi wallet features which can isolate each user, further read:

https://en.bitcoin.it/wiki/API_reference_(JSON-RPC)#Multi-wallet_RPC_calls

https://github.com/bitcoin/bitcoin/pull/13058

Edit: (To upgrade from 0.16.3 to 0.17.0)

Assuming installed 0.16.3 via sudo apt-add-repository ppa:bitcoin/bitcoin I was able to upgrade from 0.16.3 to 0.17.0 successfully by following:

cd ~
wget https://bitcoincore.org/bin/bitcoin-core-0.17.0/bitcoin-0.17.0.tar.gz
tar -xvzf bitcoin-0.17.0.tar.gz 
cd bitcoin-0.17.0/

#Install dependencies to compile

sudo apt-get update
sudo apt install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils git libdb4.8-dev libdb4.8++-dev curl
sudo apt install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils git libdb4.8-dev libdb4.8++-dev curl
sudo apt install libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-program-options-dev libboost-test-dev libboost-thread-dev libzmq3-dev

#Compile Bitcoin 0.17.0

./autogen.sh
./configure
make

#sudo worked for me 

sudo make install 

#rebooting was required for me as bitcoind was still showing 0.16.3, after reboot 0.17.0 was shown