The finer roots, the ones you don't realize you're hitting, then yes, rather invasive.
But in comparison -just as most treatments for cancer kill you to cure you, aerating isn't all that intrusive.
I can't even remember the hours spent aerating with a auger and 2" bit. That would rock the body more than splitting with a sledge and wedge.
We would drill a grid under -and just beyond the drip line of the canopy, one foot squared. Then fill each hole with a mix of vermiculite and whatever...
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