So What Actually Separates The Two?
Thinning selectively removes branches from within the crown so sunlight and airflow reach places they couldn't before, while the tree's silhouette stays basically the same. Reduction changes that silhouette on purpose, bringing limb tips back so the whole tree occupies less space.
Is It Safe To Cut Back A Tree That's Been Standing For Decades?
It's often the safer path, not the riskier one - a tree that's survived that long has already shown its structure works, so a thoughtful reduction tends to extend its life rather than jeopardize it.
People Say Reduction Is Just Topping With A Nicer Name - True?
Not at all. Topping is indiscriminate, hacking at whatever height is convenient and leaving stubs that push out weak, poorly attached growth. Reduction works cut by cut, each one ending at a branch capable of taking over the job, so the tree still looks like itself once it's finished.