Rizzler It's also about compliance. As Google aims to sell mobile Pixel phones on the consumer market and make a profit, they need to make sure (and prove) that these products comply with all the relevant standards. The relevant mobile phone standards prescribe that mobile phones connect to (multiple) base stations in order to let base stations determine which one is going to take up the communications. If you are seeking a mobile phone that connects to a single base station (at a time) then you are in fact talking about a non-compliant phone that is not allowed to be sold. All this is taken care of low-level software beyond the control of a mere user facing OS, be it Android, iOS or GrapheneOS.
One cannot have a wonderful mobile phone network if not all elements play their compliant part.
You cannot join the network if you come with a crippled, non-compliant device.