Slack, HipChat, Mattermost, Skype, IRC, iMessage, WhatsApp, Signal, Wire, etc, etc. Am I the only one that can't keep track of what service (or app) I need to

Slack, HipChat, Mattermost, Skype, IRC, iMessage, WhatsApp, Signal, Wire, etc, etc. Am I the only one that can't keep track of what service (or app) I need to use to communicate with which person, team or organization? I'll stick with e-mail until these services finally agree to federate.