I have to use UTC even when DST is activated, for some things. (Not called GMT any more as the observatory has moved, it is called unified time constant [UTC]) it is the only way to work internationally.
The problem is Union agreements and the like, I know we all wanted an early morning start on the Friday before the long weekend so we could travel home in daylight, however before 7 am it gained a shift allowance so we could not start before 7 am.
The problem is to not change from UTC means we have less daylight after work, and to remain on DST has already been tried and caused deaths on the roads in Scotland due to children going to school in the dark. I know on the Falklands the time difference changed from 3 to 5 hours, so it was a problem working out when to phone etc. And on the Falklands we had two times, Camp time and Stanley time, in the farms the farm manager would say when the workers started work, in Summer that may have been 4 am.
Clearly to have an electronic bit of equipment auto change it needs to be connected to internet and have a country setting. And in large countries a sat nav built in so it knows which time zone it is in. For example Australia is divided into three separate time zones: Australian Eastern Standard Time (AEST) Australian Central Standard Time (ACST), and. Australian Western Standard Time (AWST).
I remember travelling to the Falklands we changed our watches every other day. When sailing from Cape Town. And the radio 4 time signal is about to be dropped, not tried phoning TIM in years.