Are sequenced waypoints still displayed on the Navigation Display / FMS legs page?
Previous waypoints are not shown on the 787's CDU, and only the last waypoint or PPOS (present position at which a direct-to was initiated) shows on the ND.

The 787 EFB does not show the plane position. Only very recently the FAA allowed own-ship display on moving maps.

As to why, there is no use for it. The POS REPORT page on the 787 would show the three waypoints needed for position reports (from, to, and next).

Some airways are one-way, so it's not like a U-turn will be needed (there is also no reverse sequence function). Any emergency gets priority and a direct-to the nearest suitable airport (weather and terrain permitting).

If the whole plan is needed (on display) for some reason, it can be reloaded as a secondary inactive route (if saved, or if can be requested via uplink).

On the MD-11, the progress page shows the last waypoint (singular), but not the 787, so minor differences can be expected. Above applies to the 787's route legs and progress pages.



Source: 787 FCOM.