I doubt any consensus algorithm can be simpler than single decree paxos. But what people usually care about is deciding on a sequence of operations. Paxos made

I doubt any consensus algorithm can be simpler than single decree paxos. But what people usually care about is deciding on a sequence of operations. Paxos made live, and others have engineered their own solutions to make multi-paxos efficient at this. Raft solves much of this for you, right from the start.