Can't say I'm going to miss it
Back in 2015 I tested Riak along with Consul, Etcd and Zookeeper for an app needing a simple distributed state store. Compared to the others Riak was a beast to configue and half the time the damn thing would never even start. Just trying to connect to a newly started cluster would block for minutes and inevitably report riak.RiakError: 'unavailable'. We were totally bummed having heard great things about Erlang and wanting to give it a shot but Riak sank that ship.