The only IR I have is the TV and I can (but rarely do) control that from the alexa, I use sonoff for some temp control in the kitchen for the plinth heaters and a humidity one in the main bathroom that switches the extraction on.
Even my mother uses sonoff linked to an alexa to turn her lamps off as the plugs are in awkward positions.
I have a lot of sonoff kit but use it mainly as timers and scenes.
I'd say the most useful things I have are the presence sensors dotted around.