Google has a lot of trust in its infrastructure projects. You assert they don't therefore don't use it and you have many Google front-end platform projects that serve as counter examples to your assertion. Angular being the most popular open source Google front-end project.

Like I said, you are welcome to distrust Google, but your general assertions are far fetched and stems from Google's product engineering that has to expand and contract its offerings as they are expected to make money unlike its open source projects.