Offline queueing is a fantastic feature! I know someone who lives in a remote area whose phone only gets network connectivity when they walk up a specific hill. In many ways, they use WhatsApp the way most people used email in the dialup days: read and compose offline, then go online once a day to send and receive new messages.

Edit: I sometimes get a chuckle when they say "Look at this cool picture I took", and then receive the picture some days later when the conversation thread has moved on. I guess they'd have stayed in thr coverage area for long enough for the entire image to upload.

This is so bizarre to me. How can a native application not implement that, while a third-party application nails it!?

I know when people are in low signal as I get a green then exactly the same blue some time later.

Which creates issues when you have signal but don’t have a sub to send that actual message over sms.

Sometimes sms failover creates further problems because when travelling you’re more likely to have intermittent wifi than intermittent sms access.

I think luckily you can turn off auto sms fallback - but it does indeed default to on.