Partially Agree on this argument Google Apps vs Native App.
Firstly: I think we need some native Apps like gallary app. Why? because that could be more optimized for our devices. Google create app which is based on the generic Android platform not optimized for any perticular platform.
Secondly: On the other hand Apps like calculator, calenders, files. We actually don’t need this. Because those are not need that much optimization.
Lastly : Nothing Apps are Hosted on play Store, so I don’t think there will be any problem regarding further updates.