Mine is an anecdote of one but I was quite annoyed to learn that I couldn't migrate my Signal messages from my old Android to iOS when I switched 1.5 years ago.

Mine is an anecdote of one but I was quite annoyed to learn that I couldn't migrate my Signal messages from my old Android to iOS when I switched 1.5 years ago. That annoyance lasted about a month until I realized that I never had need for those old messages anyway. I can't say I ever really missed them once they were gone.