The Kirin 820 5G is based on TSMC's first-generation 7nm process (N7). Because it is the first generation process, the frequency is not pulled very high, so the single core performance is almost the same as the Snapdragon 765G, which is worse than the MTK Tianguet 1000, and the processor core is a generation different. However, the Kirin 820 performance is higher than the Kirin 970, lower than the Kirin 980. Kirin 970 my mate9p from 18 years to now is still smooth use, Hongmeng's blessing makes the mobile phone can still be smooth use now. So the Kirin 820 plus Hongmeng is not a problem for a mobile phone to use for 4.5 years.
Huawei's mid-range chip plus HarmonyOS can currently guarantee three years without a delay, so ordinary users can use it for three years