Latency between page going blank and FCP, poor recovery mechanisms. Significant number of users is still on occasionally bad connections (e.g. on a train, walki

Latency between page going blank and FCP, poor recovery mechanisms. Significant number of users is still on occasionally bad connections (e.g. on a train, walking into the part of the building with poor signal etc). If interaction in SPA does not work, they can try again, because they still have the UI. If page goes blank and does not load, not every user will recover from this.