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Don't forget about bond wires that need to be run to each die and/or connected to a backplane.

Doesn't the fact they have successfully demonstrated displays at 2000, 5000 and 10000 DPI alleviate those concerns a little bit?

It's not really meant as a concern, more a supporting argument: If every subpixel is identical, you can use simpler wiring patterns.

The subpixels don't need bonding wires, they have dedicated connections just like any transistor on a regular IC.