The Linux driver ABI doesn't need to be stable because the drivers are supposed to be published under the GPL. This way manufactures just need to help get their drivers upstreamed and are largely off the hook for support after that.

Androids awful graphics API is hack that allows Qualcomm to keep the driver source closed which means the BSPs rot and you can't use your phone after 2-3 years.

I'll happily buy a 10 year old SoC with half the clock speed but open source drivers over anything from Qualcomm because of how awful they are with this.