I'm not sure why you think that this approach is scary and/or
implies a lack of diversity.
Do you advocate espalier at all?
Your hypothetical proposal of killing off 90% of the trees wouldn't
work, I suspect, as they're not dwarfed by their proximity but by
their root stock. You'd have to replace them, and you'd be looking
at 7-10 years before larger trees started producing useful amounts
of fruit, and even then you'd never match the productivity (or so
it seems) of this method.
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