I think it’s at least partially readability. Signal won’t give a given line more than half my screen, where gmail will go up to 80% (slack and discord are similar). I don’t use the FB messenger app, but the webapp won’t give a line more than half the width of the screen.
However, it seems easy enough to scroll through your text messages (or Signal, or WhatsApp...), see if you were the last person to respond or not, if not whether their last message feels like the end to the conversation.
I think this is way more work than looking at “what’s still in my inbox?”, and rapidly becomes untenable as the number of messages or delay in responding increases.
I think it’s at least partially readability. Signal won’t give a given line more than half my screen, where gmail will go up to 80% (slack and discord are similar). I don’t use the FB messenger app, but the webapp won’t give a line more than half the width of the screen.
I think this is way more work than looking at “what’s still in my inbox?”, and rapidly becomes untenable as the number of messages or delay in responding increases.