For Apple, I haven't checked all the details, but the logic should be sound.
1: Due to the lithography limitation in China, it looks like Apple would always have better logic and memory chips. With AI features moving to edge devices, Apple's enhanced computing power(M4 chip is a beast) becomes more appealing. Satcom/Photography noncore functions.
2: IOS is a much more mature and huge ecosystem, I doubt foreign App/Game developers would migrate their products to the HarmonyOS, I guess there are "emulators" that can be used to run Android apps in HarmonyOS. Lack of App/Game support is a no-go for lots of people. Unless Huawei is able to vastly ramp up advanced node production, then flooding the market with cheap, high-quality devices, without much higher market shares, very hard for HarmonyOS to compete with IOS.
3: Global after-sale support and brand awareness, I doubt people can get after-sale service outside of China.
4: I saw some people posting on social media, with multiple discounts, Apple iPhone 15 Pro 256G is selling for around 6300RMB in China, the same price level as Mate 60 Pro, Unless people want to support Huawei, there are no compelling reasons to buy Huawei over Apple when they are on the same price level.