What are the advantages of adjustable beds?

Why buy an adjustable bed in the first place? Do you have reflux? You’ll feel better by raising the head of the bed by 4 inches, and you’ll not even notice the change.
Do you want to use your bed as a recliner? Most beds don’t hold up well against a sitting weight load in one spot, so I’m guessing a full-length reclining sofa can provide better support. The reclining couch or double-wide reclining chairs are the best for sitting weight loads.
Are you planning on having surgery or want a specific bed configuration for recovery? A three-motor hospital bed is a superior choice because it is easier to handle the bedding, and changing the mattress is way cheaper. If you must spend your money, a firm bed with more than 500 coil springs will outlive all-foam beds, looks better, and never smell like a dirty kitchen sponge.
Do you like air beds? The compressor’s sound will wake you up. Nobody wants to have disturbed sleep. Those air channels have a limited lifetime, and you should be lucky if you can use the warranty to fix it. I mean, no offense, but I really can’t understand why someone would buy them.