Its bad because a perfectly good tree can be caused extensive permernant damage without consultation.
The case you showed seemed fair, but too often this is done over trivial issues like leaves falling
Geez thats nature, thats the beauty of trees, yet coz some anal retentive cant cope with sweeping up a few leaves on the ground they butcher the neighbours tree.
Thinking it is ok to cut up to 50% of the canopy and 50% of the roots off a fenceline tree and not give a stuff it it dies or falls over as a result is not exactly caring about trees.
How could you be so anti-lopping but think treating trees this way is fine?