Airbus published an OEB last year that required the HUD to be selected off by 1,000 ft AGL for manual landings. The OEB was published after several operators experienced hard landings that were attributed to high sidestick activity during the flare, caused by an over sensitive HUD FPV. I suspect the pilots involved were distracted by the FPV bouncing around and missed the cues they would normally use during the flare. I believe the problem was worse at night-time, because the display is quite bright, even at the dimmest setting. A new HUD standard is now available that cancels the OEB and manual landings can once again be flown using the HUD.
The A350 isn't difficult to land, but it is different to the A330; if you flare it like an A330 you generally end up floating a long way down the runway. The A350 is also much more sensitive in pitch and roll.