Arch doesn't require you to "read through all changelogs". It only requires that you check the news. News posts are rare, their text is short, and not all news posts are about you needing to do something to upgrade the system. Additionally, pacman wrappers like paru check the news automatically and print them to the terminal before upgrading the system. So it's not like you have to even remember it and open a browser to do it.
Arch is entirely about “move fast and break stuff”.
No, it's not. None of the things that make Arch hard for newbies have to do anything with the bleeding edge aspect of Arch. Arch does not assume your use case and will leave it up to you to do stuff like edit the default configuration and enable a service. In case of errors or potential breakage you get an error or a warning and you deal with it as you see fit. These design choices have nothing to do with "moving fast". It's all about simplicity and a diy approach to setting up a system.