At times, I've been invited to partake of breakfast in the lounge when I arrived mid-morning and my room wasn't yet available, but I would never ask nor would I try to get food in the lounge in such circumstances without being invited to do so.

IMO it's only if your room isn;t ready when promised (check in time or approved Your24 request) that the hotel owes you some customer service gesture such as breakfast or a drink while you wait.