I never have needed it with Gentoo. But learned to have a backup os when using Arch. It was a learning lesson to the rolling release distros…
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Too slow. You want to be able to quickly boot something you know works and patch a file in the rolling release, and @ihasama is right… it does not need to have a DE.
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Our experiences are different, i have not used a rolling release in a long time so no comments about that.
My preference is usb rather than waste space on another partition on a ssd.
But we work differently so each to his own
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