An inane point. Obviously it's a "preference" rather than a "requirement" that my text editor boot in less than 30 seconds. But it's also not a functional requirement that Home Depot's POS terminals take a long time to start. If you could do the same checks and caching in a few hundred milliseconds it would only improve the usability for the cashier. You haven't made a case for why some user interfaces shouldn't start instantly, only that their slow start-up _might_ be justified