However, this issue is entirely manageable, of course. It's called flying the plane. It's just a bit more difficult, you cannot spend extended periods of time looking somewhere else if your plane is not in perfect trim.
That’s what the AP is for?
TBH this is a feature on the 777/787 not a bug (C*U). The aircraft (through the yoke, thrust levers, PFD and/or view out of the window) is telling you that you are not at the speed you trimmed for and to pay a bit more attention. If you are on approach near the ground and it becomes nose heavy you know before you scan the speed that it has dropped, plus the AT will help you by increasing thrust to compensate. It’s behaving dynamically much as a non-FBW aircraft would under these circumstances, so allowing it to feel more natural, save the lack of pitch/power couple. Control the path with the elevator, control the speed with power (AT does this) and keep it trimmed.
When you fly the actual aeroplane, it makes more sense.