Signal System Tray Icon Why Doesn't It Have One?

Almost all the other chat clients I have can run in the background showing only a system tray icon…

Why can’t Signal?

• Slack
• Discord
• WhatsDesk (WhatsApp)

I think:

• Facebook Messenger – Or it just harasses me.

I guess if they did so I would hope that it at least has some marker to show that conversation has happened.