A heat-resistant grilling glove is the only proper tool to use with a kamado or any other grill because it allows you to comfortably lift hot grill grates, pizza stones, heat deflectors, and anything else that gets hot by the grill.
Yes, in a pinch you could use an oven mitt or welder’s glove, but neither offers the same level of heat resistance, and both are bulky in hand (trust me — dropping a grill grate full of food will ruin your mood).

A good heat-resistant grilling glove can withstand temperatures up to around 600°C, meaning when lifting a grill grate at 200°C with the glove, you barely feel the heat. It also ensures essential safety.

When do we use our glove? The short answer is: all the time when working around the grill (except when placing or removing food on the grate).
Mainly, it’s used for moving grill grates, removing the LUX system to add more charcoal, or removing/adding heat deflectors inside the hot kamado.