That doesn't do ActivityPub (or ATProto) justice. The inverse would be "more complicated RSS". But it is way more than that. You get semantically meaningful typed messages on AP. Most people think of AP as what you get on the fediverse, where basically the only type in use is the ActivityStreams Note object. But it can be anything that is transferred in a standards-conform interoperable way.
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That doesn't do ActivityPub (or ATProto) justice. The inverse would be "more complicated RSS". But it is way more than that. You get semantically meaningful typed messages on AP. Most people think of AP as what you get on the fediverse, where basically the only type in use is the ActivityStreams Note object. But it can be anything that is transferred in a standards-conform interoperable way.