Sometimes I wonder if people underestimated the effort and hours that go to get many of these functionalities to work in whatever cloud platform they are in. And then test them or fix issues when there is some unexpected thing there...

No they do but the amount of work that’s required is much less most of the time. You can always define the problem in such a way that there is no difference between a cloud and non-cloud solution but 12 years being in the business of deploying to cloud and non-cloud, the types of issues I’ve seen are almost always easier to get around on the cloud