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If you want to talk about breakage we can, as long as you understand that’s not what people mean when they say stable. About breakages Arch doesn’t break that often, or at all, I can’t recall a single time my system broke for an update or for something that was not entirely my fault.
Nope, you’re missing the point entirely. It’s about versions not frequency. For example Ubuntu 16.04 used python 2, despite python 3 having been released for 8 years at that time and other distros like Arch having migrated to python 3 years before. Now, Python 2 still got regular updates that Ubuntu released, but Ubuntu 16.04 was maintained until 2021, whereas python 2 reached EOL in 2020, that means that for 1 year Ubuntu was using a deprecated and unmaintained version of python.
One could also make the argument that Arch broke a lot of stuff when they did that upgrade, and there’s an argument there, but it’s not as simple as receiving less frequent updates.