Bye,
I think you are in a minority of one there.
Whether it is a surge bleed valve or a systems bleed valve is irrelevant.
The anti ice bleed valve is selectable in exactly the same way as the HP bleed valve, or modulating pressure control valve.
Yes, the Trent 1000 is more efficient because it does not use bleeds for air con or running hydraulic pumps, but it still has surge bleed control valves like any other engine.
Mr Snuggles.
The 787 battery does not replace any of the pneumatic systems previously powered by bleebyd air from the engines.
The APU battery will start the APU and run some external lights during battery only towing.
The main battery powers essentials instruments, some external lights (during towing) and emergency brakes.