I'm not sure if they have the software dev capability. Sure, they make nice UIs/apps on top of Android, but what about core computer science and domain specific

I'm not sure if they have the software dev capability. Sure, they make nice UIs/apps on top of Android, but what about core computer science and domain specific skills? The new OS they tried to make was apparently full of kernel level bugs. Google has ML experts, compiler experts, etc. who probably contributed a lot to this. I guess it is a perk of keeping domain experts in the company who are there to advise when time comes.