I use Signal with my friends and family but I often wonder how secure our devices are. As a layperson, it seems that Signal's E2E encryption is secure but I wonder if the keyboard I use is keeping a record of what I type or if my device's clipboard might keep track of what I copy/paste. Hell Android could be taking screenshots and sending them to the FBI and I'd have no idea.
E2E is great but I don't think it's a silver bullet for private communication.