For a single occasional trip, the gap between a fixed fare and a surge-priced app fare might only be the difference of one journey. For anyone travelling to or from an airport regularly — a frequent business flyer, a family with recurring holidays, a company sending staff on the same routes — that gap repeats every time demand happens to spike on the day you travel, which over a year adds up to more than most people expect. A fixed-fare account also means there is no need to check the app or compare prices before every single trip; the rate is already agreed.
There is also a planning dimension that only shows up with repeated use: a pre-booked service can hold a driver for a known regular pattern — the same early flight each month, a recurring client run — in a way that an on-demand app, by its nature, cannot guarantee in advance. For occasional, spontaneous city trips this does not matter at all; for anyone whose travel follows a predictable pattern, it is often the more significant difference over time.