I don't know if this is a Garmin thing, but almost to the day that my 296 reached 10 years old, it stopped receiving satellites.
As I only used it in my own home built aircraft as a VFR backup, I had never bothered with the hassle of updating it.
Problem was, it fell over the very day I was rather hoping it would be a help on a Bass Strait crossing from mainland Australia to Tasmania in some barely VFR weather.
Certainly if you are hiring an aircraft, it would be reasonable to require all equipment to be 'in date'. In some jurisdictions that is also a legal requirement when the aircraft is available for hire, unless said aircraft has a MEL specifically allowing otherwise.