I really don't understand why mobile phones have the same internal hardware. Just sell it in different places. Use different software

There has to be something so different, like different hardware, that it's annoying.

iQoo 12 using OriginOS has all bluetooth audio codecs and supports snapdragon Sound.

But why does iQoo 12 using FuntouchOS 14 cut out some bluetooth audio codecs and disable support for snapdragon Sound? Why?

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I have a xiaomi phone that is a model that has been out for 2 years, connected to my headphones, it supports Snapdragon sound, works fine.

Why is the iQoo 12 (with FuntouchOS), which is better and newer, still unable to provide a better audio experience?