The main advantages of temporary email are convenience, reduced exposure of your primary address, and easier testing. The disadvantages include short retention, possible domain blocking, limited account recovery, and privacy concerns when using public or shared inboxes. Temporary email works best as a disposable convenience, not as a replacement for a permanent mailbox.
For practical use, always review the provider rules and avoid sharing sensitive information through temporary inboxes. A temporary address is best suited to low-risk, short-term interactions.