Bit of history here, RUM was part of APM and you can still find all those different transaction types like page load, route-change and User interaction in the APM UI where you can analyze transaction duration which is eventually the load time duration of different transactions.
We are building the User Experience App specifically for RUM use case and kind of in the transition phase and currently only focussed on hard reloads as Core web vitals and other metrics would be applicable to those hard navigations and not for SPA and other transaction types. We are working on the next iteration which would bring in additional capability like exploring the data for different transactions and analysing the performance distribution.
I hope this is helpful. Let me know if you still have any questions.
Thanks,
Vignesh