Cooking your food on high for a long time isn’t always the best idea when making your microwave last longer. Most newer microwaves have heat sensors that can detect when food is finished cooking all the way through.
Using these pre-programmed settings, you will protect the interior of the microwave from boiling splatter and avoid spills that can turn into bad-smelling burn spots and even corrosive damage on the inside of the unit that can decrease the lifespan of a microwave.
Also, the microwave will not be overworking itself to heat your food when the food is already done cooking. You will also be minimizing energy loss and use of energy overall for your home utility bill.