It might not be that benign if your favorite instant messaging app "just happens" to keep a log of your past sessions.

Here's a screenshot of my most recent Telegram sessions. In one of them you can clearly see the motherboard type. A motherboard that didn't receive any security patches since it was released in 2012; Thanks ASUS.

I'm sure this is still a secure device, that's why I'm "definitely not planing" to add an air gap (AKA permanently remove all network connections).