I’ve also seen a switch from rdbms to Hadoop because a company had “millions” of rows. Luckily on this one I only had to rewrite a handful of queries.
Wat. That's gross. It probably costs them more per query now than the rdbms did.
That certainly is a thing that happens, but you could use that to dismiss any technology at all. In the case of Kubernetes, it makes operations a lot easier to the (important) effect that the development teams can do a lot of their own operations work. This is important since they're the ones who are empowered to solve operations problems and it also eliminates the blame game between ops and dev. Further, it eliminates a lot of coordination with a separate ops team--the dev teams aren't competing to get time from an ops team; they can solve their own problems, especially the most common ones. This also has the nice property of freeing the SREs to work on high-level automation, including integrating tools from the ecosystem (e.g., cert-manager, external-dns, etc).
Kubernetes certainly isn't the final stage in the evolution, but it's a welcome improvement.
No, you can't; you need three (-ish) factors:
1. The technology is sufficiently incompatible with what you're currently using that you need a rewrite to use it (eg, this generally doesn't happen with gcc -> llvm, for example).
2. The technology is sufficiently (faux-)popular that it's possible to convince a pointy-haired boss that you need to switch to it (eg, this won't work with COBOL anymore, though unfortunately it successor Java is still going).
3. The technology sucks.
And really, if you want to dismiss a technology, point 3 ought to be enough all on its own (particularly since that's presumably the reason you want to dismiss that technology).
Anyway, we're trying to assess Kubernetes' value proposition (i.e., to answer "does it suck?"). If your system for answering that question depends on already knowing the answer, it's not a very useful system.
Well, I'm not, since I already know that, but if you don't know that yet, then your position makes more sense. (That is, using "dismiss" in the sense of finding out that it sucks, rather than (as I read it) in the sense of justifying a refusal to use technology that you already know sucks.)
Unfortunately, due to market-for-lemons dynamics, it's usually not possible to convey knowledge that a particular technology sucks until things have already gone horribly wrong. See eg COBOL or (the Java-style corruption of) Object Oriented Programming.
and in short order you will reap the savings of being able to hire people who already know your devops/infra tech stack, and can hit the ground running. not to mention being able to benefit from the constant improvements that come from outside your org.
My impression is that the primary purpose of Kubernetes is to give SRE teams political air cover to rewrite a lot of their existing processes. Whether Kubernetes is actually required for that, or even net superior seems questionable. This unsexy work becomes justifiable because it's coupled to a mainstream accepted tech modernization.
You see this same phenomenon with database migrations. Where what the team really needed to do is just rewrite an app to use the existing database properly. But no one is going to approve that work. So what happens is people convince themselves that the existing tech sucks and use that to rationalize doing the rewrite. The result ends up not always being net superior, because sure you did the rewrite but you are also eating the operational cost of integrating a new technology into the org.