I've been ignoring those for decades with no ill effects.
If you look at the voltage curves, Alkaline batteries start at higher voltage than NiMH but drop below NiMH voltage pretty quickly, so unless you have a device that stops working when your alkaline batteries drop below 50% charge or so at 1.2V, there's no reason to avoid NiMH.
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I've been ignoring those for decades with no ill effects.
If you look at the voltage curves, Alkaline batteries start at higher voltage than NiMH but drop below NiMH voltage pretty quickly, so unless you have a device that stops working when your alkaline batteries drop below 50% charge or so at 1.2V, there's no reason to avoid NiMH.