If you don’t need realtime parity, I’ve had no issues on my media server running mismatched drives pooled via MergerFS with SnapRAID doing scheduled parity.

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The AI lied to me, as I booted a Fedora/Gnome VM and couldn’t find that option. My only other guess would be maybe an extension like this was installed and forgotten about because I tend to do that

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Correct, it’s not obvious when first diving in but the main use for RAID is increasing performance and availability by allowing up to a specific number of drive failures. For that to work, ideally in an enterprise you’d have a primary and secondary controller to mitigate that point of failure which is not typical for most homelabs and makes backup even more important.