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It's not about you in reality, just trying to save users some headaches. On the contrary you have no idea what I have tried and more importantly what rigorous comparisons my company has done to select the basis for our products. There are lots of choices, most of them have better trade offs. The ones I listed are also free software. It's no different than comparing/contrasting RDBMS.

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I'm a varnish user and I have no complaints. It is well documented, easy to use and solves complex problems with VLC/VMODs. I'm not pushing nowhere near 100GB/s, but I have benchmarked up to 10GB/s which isn't a problem with default settings and just 1-2 CPU cores, this was with 8kb payloads. I'm sure you have some edge cases which requires heavy OS tuning, but I would not say it is fair to warn users against Varnish.

With 100GB/s and very small HTTP requests you are clearly in a different group than 99.9999% of the rest and most likely also have the resources to write your own special case http cache or you could hire phk@ as a consultant.

These are both fair points, my perspective is from high scalability and some of the public technical marketing about its scalability wound me up.

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