Earlier quoted context omitted.
Most of them are choice of the OEMs - e.g. Samsung held back Digital Wellbeing on their S9 phone updates so it could market their own reimplementation on S10 series. Everything marketed here is available to all OEMs - Pixel specific features are marketed on Pixel marketing pages.
... We're getting more and more into an age where mobile hardware doesn't matter anymore, because it's become so fungible. And Samsung will do very badly, because they're hardware is good, but their software sucks so bad.
I used to hate Touchwiz.