Its makes no different. Harmony OS has no huge software support. While android has a huge software based. Why reinvent the wheel? Android is an open source free OS. Google cannot stop it. Yes, you can install GMS yourself and will the most take you 30mins. Mind you, its only one time installation. I dont think it will cost too much hassle if Huawei smartphone hardware is much superior to rival of the same category but lower price.I once bought a phone from China.
There's no Play Store or anything Google.
Must installed by myself.
But I quite disappoint with Huawei Mate 30.
I thought they are going to use HarmonyOS in this one.