I acknowledge that your vehicle is an AWD model; yet, I am astonished that the rear brake pads have deteriorated more rapidly than the front ones.
If you want to retain the automobile for many more years, you could consider examining the KIA service plans. Their prices are cheaper than those of most franchised dealer stores, and reduced fixed-price MOT testing might be included.
In the event of any issues with the brakes or the AWD system, the individual conducting the MOT test will typically alert you. Based on my experience, they often highlight pad and tyre wear well before reaching the minimum recommended thresholds, anticipating that customers will respond with, “Oh, please repair them while the car is in the workshop!” or they may propose scheduling a follow-up appointment for the following week. Dealerships often change brakes and tires because to the substantial profit margins associated with their pricing.
I am uncertain whether you plan to retain the automobile, nor do I possess knowledge about its whole KIA service history. However, a 2021 model should remain under warranty until 2028, provided it has been maintained according to KIA's requirements. As a vehicle ages, it has significant monetary value should any substantial issues arise.