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I've updated an Arch install after not being used for 2 years. I don't think there were any issues.
I've experienced far more issues upgrading to a new major release of an apt based distro though...
what did you do to that poor oldstable, you, you... monster!?!!?
That apt based distro was Ubuntu, wasn't it?
I never successfully upgraded that from one release to the next.I had success in upgrading a core ubuntu server with only apache and PHP installed … But I don’t think there is a less complicated ununtu install possible.
Then you were definitely lucky with the timeframe. Arch specifically sometimes has updates you need a recent version of pacman to even apply, which means you'll be left behind if you wait for too long. Last time was the switch to .zstd compressed packages: if you didn't have a pacman that supported them you had to manually go and find a pacman from the correct time frame plus all it's deps.