Lard has been used FOREVER in making soap and I believe it is WONDERFUL in soap! One could argue that it is the original oil used for making soap way back when our ancestors used wood ash for lye.
Lard is also a topic of debate in the soap world since we live in a modern world where plant-based oils are readily available. Please note that I love plant-based oils! I use them in all my soaps. I started using lard as a "historical" experiment, then promptly fell in love with how it saponified and performed in soaps. Give it a try!