So is there any kind of advantage to having the full node?
The main advantage I see is being able to open an old wallet, or import an old address (watch-only) or private key.
everything together isn't taking up 2TB, is it?
It's about 550 GB now, and usually grows by around 2 GB per week.
But, to have only the final part of the no, is it viable for the person to obtain the same confidentiality or privacy?
In terms of privacy, yes it has the same level of confidentiality and privacy as a non-pruned node.
I'd like to add: for privacy, run Bitcoin Core through Tor, and
always make use of Coin Control.