couldn’t they still achieve this by creating some filter that says “family” within the Disney+ app so that they can still isolate toons and family movies and series?

They could, they have, and so has literally every other major streaming service.

The rest of us are rightfully pissed off at the balkanization of content forcing us to pay for a hundred different subscriptions and this person is arguing that it must continue, lest easily filterable content exists on the same service 🤦