Ultralight Wings (Player Core pg.289) says "You can deploy the wings with an Interact action...While the wings are deployed and you're not encumbered, you gain a fly Speed of 20 feet...". Is the intent that a player should need to deploy them manually before any time they plan to use them? It makes some sense with something like a jetpack that you wouldn't want to always have it active, and it has rules that reflect that.
Or is it simply like having weapons drawn where there's only potentially a loose social understanding of "hey man, this is a Space Denny's, can you put the wings away?"