Yep, we are into the latest BPing technolgoy as it relates to Light.
No GPS that I know of weighs less than my compass and topo map(s). The rest is additonal weight I do not need to carry.
Lets separate mountaineering activities from backpacking. I do see the benefit for "mountaineers."
The majority (not all) of the BPing rescues I read about are due to stupid or ill-prepared people. I have been backpacking for 40+ years, and almost always solo. Not saying an accident I can't be prepared for, won't happen. But I try to stack the odds in my favor. And I am probably not as "proficient" as many others here on the forum. But I know my limits and do not put myself at "risk."
I remarried 7 years ago. My wife had never done any outdoor activities and she has no interest in BPing at all. However, we do camp (tent trailer) and/or hike nearly every weekend, if I am not out solo. At first she was so against the solo BPing. But after several outings with me, and observing how I prepare for each BPing trip, she is not worried at all when I go BPing. She does enjoy reviewing the maps as I plan each trip. She does roll her eyes as I weigh items and ponder of different combinations/pieces of equipment. As a matter of fact, she surprised me a couple weeks ago with a GG Mariposa Plus for my birthday.
My first wife didn't worry either, and now that our colleged-age son is into BPing, she is not worried for him, as I have been teaching and buying him gear.
Bottom line…
This is one of those topics that no one is going to "win." If you feel the need for a SPOT, GPS, Phone, etc. then, by all means, bring it along. If I run into on the trail, I will not think any less about you as a person. But these items may not help you if you are not educated and prepared.