Why would you use a In-Wall Relay over a normal in-wall switch?

Does anyone have a current recommendation for an in-wall application of a relay, ideally relatively inexpensive? I’ve purchased an Aeon Labs in-wall micro, but at $31/ea, it’ll hurt to automate everything I want to. Also, I’m unsure if I have space in the gang boxes. I was going to buy a dual toggle from Aeon, but Amazon no longer carries them.

I’ve considered sonoff’s dual wifi relay, but I’m concerned installing in-wall would be a fire hazard.

I’ve looked for this information just about everywhere I can think of, and everything useful I find seems to be outdated or the product is no longer sold.

Any help is appreciated. Thanks!