A good article on when and how to use biscuit joints. Glad to see someone else who does not believe the myth, "They are for alignment only and don't add any strength."
https://www.wwgoa.com/article/using-a-biscuit-joiner/?utm_source=newsletter&utm_campaign=A6134
A_Biscuit_Joiner_Can_Be_Used_For_Almost_Anything.pdf