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In addition, if TCP_NODELAY is set, it MIGHT help to mitigate consequences of exponential backoff algorithm in case of lost packets.

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All of us are seeing 'hung' HTTP connections on a regular basis – that is, when we've clicked a link, and the page loading is stuck forever.

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In general, lag and jitter are not specific to UDP, and manifest themselves for absolutely any Internet connection.

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If you need a globally-reachable server with single-digit-ms lag for all the players, it is simply not possible

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Why bother with UDP at all? The answer is simple: there is a price tag attached to the TCP goodies.

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Implementing your own reliable-delivery protocol over UDP is extremely complicated, time-consuming, and error-prone.

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If your game is the only one working when all the competition is down, it improves user perception about your app a lot.

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Most importantly, however, this approach allows to keep your players happy – and this is one thing which really matters