This is basically a build vs buy discussion. Businesses have generally concluded they should only build things that give them a strategic advantage and buy other services to maintain focus on their sources of competitive advantage. Eg in the case of k8s, it's not just spinning it up, it's securing it, patching, monitoring, etc. It's for this reason the majority of orgs shouldn't run it themselves.
However some balance is needed. Orgs may want to do exploration since it may not be obvious where competitive advantage can come from, or like you say perhaps hybrid makes sense, using it only in non prod.
I agree that it makes more sense to buy your Kubernetes on an organizational basis because one should not reinvent the wheel, and taking advantage of a commoditized service is only possible if you work with a competent broker.
However I am wary of the capacity of skills vendors to take advantage when you come to depend on them, even when their intentions are good and all ideals aligned. Being able to deliver the limited Kubernetes experience for yourself in low-stakes contexts, where you can depend on it because you know how it works, well enough to administer in a pinch, but availing that also in a pinch you're not the bottleneck to solve a problem, because you use the managed broker in all the places where it matters, feels like a sweet spot to me.
I don't want to pay money to a broker every time I spin up a new experiment for the duration of the experiment =/= I don't want to perform experiments.
That's where I see the disconnect that "Leadership" may fail to understand. You can provide a service at low marginal cost to take some of the load off your people, and that might also have the effect of stopping any experiments that fall beneath a certain threshold as "not worth the cost" - all because we settled on getting something for cheap that should have been free.
Then again, dodging all those diversions might have been a part of the strategy...
However some balance is needed. Orgs may want to do exploration since it may not be obvious where competitive advantage can come from, or like you say perhaps hybrid makes sense, using it only in non prod.