Why would you use L2TP by itself?

Javik

What is the purpose of setting up L2TP if you cannot encrypt the connection?

Although PPTP is theoretically hackable, it seems like using it is better than nothing.

"Nothing" appears to be defined as using L2TP alone, without IPSEC.

jimp

There is some gear out there that can do L2TP on its own for tunneling only. If the protocol run over L2TP is already encrypted, it's not a huge deal.

On 2.2 to get L2TP+IPsec you setup L2TP and IPsec together using both options individually.