Even if pruned node only saves N number of blocks, it still verified ALL the previous blocks that it downloaded (and deleted).
It doesn't just download them from a server nor work like an "SPV client" that relies on other persons' full node.
I understand. In this sense, if the person has this space availability, it is recommended to have the complete node. If you really want to operate a node, of course.
In fact, if a person also wants to have an LN channel, they need the full node, right?