They don’t have to but it might buy them some goodwill. Some people have only just bought the 255 not realising that Garmin was going to release an updated watch much quicker than they usually do.
Garmin has a large collection of watches, and they update with new models quite often. It is fairly rare that watches get new features after they are launched, but the 255 already got running power. Most Garmin watches have intentional software limitations to make buyers want more expensive watches.
