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I am not saying that this architecture is the only viable one, but it does work for TCP for sure (and performs reasonably well too)

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The whole task of optimizing performance beyond, say, 20-50K packets/second per box tends to be Quite Elaborated, and involves quite a few things which are platform- and hardware-dependent.

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TCP is a byte stream, the whole byte stream and nothing but the byte stream

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if all packets reach Client, there isn’t that much difference between TCP and UDP

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Yes, you DO need to encrypt your UDP traffic. And no, using UDP is NOT a valid excuse to skip encryption

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Personally, I prefer to think of it as of insurance - when I'm paying my premiums in hope that my money will go to waste.

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you may think of UDP as of an analog of good old C: you can do pretty much everything, but it is not because the language helps you – it is rather because it doesn’t stand in the way :-)

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As most of the routers (including pretty much every backbone router out there) are not configured to support multicast, it makes multicast over the public Internet hopeless :-(