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I love Jepsen, but it seriously worries me how bad software turns out to be, and how many outrageous claims companies make that turn out to be so easily proved false. Should there be more serious penalties when companies make claims which turn out to be false as soon as they are tested? I think there should be.

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Well some company try to implement Raft algorithm with good intentions but do a bad job a at so bugs make it so they fail Jensen test.

You can’t force people to test their software correctly unless it’s a regulated field like aviation.

I don't think any company explicitly claims their implementation handles X failure scenarios, certainly not in the EULA or license. You could possibly pick apart their documentation, but I think the warranty clause in most licenses would cover the product. This may not apply to regulated products dealing with health/safety/defense, and IANAL.

Either way, best to assume most companies are lying through their teeth about any feature until you or someone you trust has validated it.

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