Should I worry about humidity and conditioner for my leather mousepad?

Yes to both — humidity can degrade the leather faster, but conditioner won’t mess with tracking if you apply it right. Leather absorbs moisture from humid air, causing swelling, warping, or mold that ruins the gliding surface. A dehumidifier or silica pack helps more than conditioner. For conditioner: a light coat, let it soak in, buff dry — optical and laser sensors read texture, not oils. Wipe excess and let it cure for a few hours. Condition every six months; control humidity year-round.