I’ve had a similar idea recently.
Thing is, this block manager shows block definitions, not their scene instances.
@wim argued that the problem is - which block instance should be opened in the viewport when you edit a definition?
How about this:
1 - Enter block edit mode simply for the first instance of that definition.
2 - or the next best.
3 - or, best option, add a block edit mode like in AutoCAD, where nothing else is visible (not even gray) but the block itself, with the block origin at scene origin.
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