Just get on the road with a 3/4/5G connection on a mobile phone if you want to understand why we still need to design for "iffy" Internet. So many applications have a habit of hanging when the connection isn't formally closed but you're going through a spotty patch. Connections to cell towers with full bars and backhaul issues are surprisingly common. It's a real problem when you're dealing with streaming media (radio can be in the low kbps) or even WebSockets.
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