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Does Arch or Cachy OS force you to keep up to date until your hardware cant match it? SOLVED
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With Arch partial upgrades are explicitly not supported. You either upgrade all packages to the current version or you upgrade nothing. With Debian that's different, you can upgrade a single package (with its dependencies) just fine. Technically you can do whatever you want of course.
That said, I wouldn't really worry about upgrades, even on old hardware. Choosing a desktop environment is much more impactful if you worry about performance.