A guest has a poor second night — noise from the corridor, a slow breakfast. At checkout they are asked whether everything was fine and they say yes, because almost everybody says yes.
Four days later a detailed review appears publicly. The property reads it for the first time alongside prospective guests, and can now only respond in front of an audience rather than fix anything.
The gap is not that guests will not tell you. It is that the only moment you asked was the least likely moment for an honest answer, standing in a lobby with a bag.
A feedback request tied to the actual stay, arriving on a channel the guest reads, catches a meaningful share of that before it goes public — and because it is linked to the visit rather than generic, a complaint about slow service can be read next to the order timings and a compliment can reach the person it is about.
The same link is what makes the loyalty side behave. Points settle when the bill settles rather than being awarded from a spreadsheet a fortnight later, and a hand-set tier survives every nightly recompute so a guest you promised Gold to stays Gold.
Why this matters to you: a private complaint is an operational problem you can solve for about the cost of a breakfast. The same complaint published is a marketing problem that costs bookings for a year.