The cloud makes it simple. They offer you managed service X. They hire experts for service x and you pay a part of the cost on top of your infra cost. No searching. No vetting. You just use the service.
I see the why this might be attractive. It isn't to me. But the pencil pushers like it.
Your engineers who all have to possess AWS or similar certs before you hire them, work for free?
A move off VPS to managed services doesn't reduce your headcount or labour costs.
I think there is a very narrow space where you need the resources that this provides and it's not yet more cost effective to have your own team of admins. At a certain headcount a the number admins don't matter that much anymore.
If you're using managed services that are so complex you need certified people then you're doing it wrong
To some management types it looks like a good deal to not deal with that and just let Amazon/Microsoft/Google/etc. deal with finding people to support the service and just pay a bit extra to the infra cost. Then you can only hire cloud infra admins. I don't think it works that way but that is what I have observed.