Most source code is static. In case you want to show a diff, you normally do this with a side-by-side view, regardless of whether you show the diff as textual source code, or as two diagrams.
The transformations you sometime see in Youtube videos of moving and removing small bits of code to e.g. show the differences between a piece of functionality in an object oriented vs functional language are only useful because they require your eyes to follow relatively few points of interest.
Source code is of course a static thing. It's text. It only changes during commits.
Code is dynamic. It runs. The abstractions in the machine are doing things, which are changing things over time, in many different places, and it can be difficult to keep those movements all in your head without either a ton of practice, or lots of practice and some decent foundation to build off of.
As an independent phone maker, if this was their concern, they should have backed one of the other dozen or so attempts at a phone OS. No one forced them to choose Android.
They also have the option to write their own OS anytime they want.
