Nope. It doesn't say why the process itself is cumbersome. They just state that it is for various reasons. And I'm not even talking about upgrading without do

Nope. It doesn't say why the process itself is cumbersome. They just state that it is for various reasons. And I'm not even talking about upgrading without downtime I mean the problem that you can't just replace 14 with 15 without preparing the DB upfront.