In bushcraft context the only technology I find useful is one that lasts for a long time.
Fenna's distinction of gadget/tool applies too.
For example: My phone is with me, but switched off, since the batteries run flat and when that happens I would have been better off leaving it at home. Serves it's purpose if I get in trouble.
Headtorch: Good to have, but again, no point in running around with it lit all the time. The faster it runs out, the sooner it becomes just dead weight.
The things we rely on in bushcraft, knives, flint, saws, axes, rucksacks and so on, they are useful because they require no fuel to run and they can be maintained for a long time. Imagine if there was an electric knife of some sort that never has to be sharpened and cuts effortlessly through the hardest materials. Only downside is that it has a battery which lasts 5 days and is useless without one. I doubt people would use it for bushcraft, even though it has superior characteristics. If smartphones could be kept running for a month at a time I wouldn't think of leaving it behind. Using it and relying on it is a matter of preference.
For that reason besides a headtorch another electronic piece of kit I use is a watch. A Suunto Core namely. And the only reason it is of any use at all is because the battery lasts for 1-2 years. If it would be 10 days then I would consider leaving it at home. But as it is currently I can get nice info on my watch. Air pressure, sunrise-sunset times, the date, air temperature (or water), altitude. It would be worthless without a good old map and compass, but it also gives a bit of extra. I wouldn't want to rely on it entirely, but it's good to have.