When people say to change the core to target heroes instead of minions, I can see people forget one essential thing about this game: Minions are the real threat to structures because they do bonus damage to them (someone can confirm the number because I don’t remember what it is).
This is mostly why people lose forts to early objectives. When the enemy gets the objective and pushes with it, what actually kills the fort are the minions, not the objective/heroes. Clear the minions and the enemy push power will go down drastically.
This applies to when the enemy is pushing to core as well. The core focusing the minions first creates space for you to clear the catapults (the real threat late game) and then focus the objective.
It tilts me so much when people are trying to defend the core running around trying to kill the heroes when they just needed to clear the wave + catas.
Anyway, my point is, core focusing minions instead of heroes is a good thing because it is removing the actual threat from itself.