It allows you to do partial updates, but indeed it doesn’t support view transitions out of the box. :/ That said, the native wrappers offer built-in transitions, and you could probably hack web transitions with some modding and a component library.
I like your optimism, but I would like to remind (scare) you:
If you decide to put your effort into customizing the framework, you increase your risk of building
> [...] your poorly cobbled-together "framework" for the next 2, 3, or more years. If anything changes and pages stop working "right", you get to pick up the pieces. Yes, "you", because since your framework is something that you pieced together, there are no "tutorials" nor stack overflow questions nor manuals to refer to.