I disagree–a system (even Arch!) should be able to update after a couple months and not break! I recently booted an EndeavourOS image after 6 months and was able to update it properly, although I needed to completely rebuild the keyring first
Arch and EndeavourOS are the same thing. There is no functional difference between using one or the other. They both use pacman and have the same repos.
I’m using opensuse tumbleweed a lot - this summer I’ve found an installation not touched for 2 years. Was about to reinstall when I decided to give updating it a try. I needed to manually force in a few packages related to zypper, and make choices for conflicts in a bit over 20 packages - but much to my surprise the rest went smoothly.
I know this is how it’s supposed to be and how it should be but sadly it doesn’t always go this way and arch is notoriously known for this exact problem, the wiki itself tells you to check what’s being upgrades before doing because it might break. Arch is not stable if you don’t expect it to be unstable.