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> I run memcached at a large scale

I don't believe you run it at the scale Slack does.

The people at Slack who decided to use Mcrouter (and created Mcrib) have experience running Memcached, Mcrouter and Nutcracker in production at two of the biggest web properties in the world.

Trust that they know whereof they speak.

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You may not be wrong, in fact you are very likely right, but this is not an argument.

The larger an org gets the more likely it is to do weird things to mitigate organizational difficulties be them budget, human or otherwise.

Those types of things rarely show up in postmortems for obvious reasons.

"I don't believe you run it at the scale Slack does."

Definitely not. We host about %80 of elementary schools in the US. Not slack scale but definitely face many of the same issues :/

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