>> Up until recently PLBs did not exist, and people went walking quite happily, even on long trips <<
Which can also be said about carbon fiber poles, Titanium, Cuben Fiber, and high tech trail runners …
Seems that improvements in navigation and communication (and being rescued) is harder to accept than improvements in materials. I hope you turn down the Helicopter ride in favour of a horse if you are ever rescued (after all, they never used to use helicopters and people were still rescued).
I carry an inReach and here's my thinking…
Every time I wander somewhere that feels remote or even take a diversions that takes me off trail I ask myself, "OK, if I fall down here and can't get up, what would I do?". Typically, the answer is that I'd wait until somebody reports me missing. It's really unlikely that somebody will happen upon me.
So for me it's an easy decision… carry a few extra ounces and make the emergency call myself (and not wait a couple of days for somebody else to do it). It probably won't happen to me and I'm pretty resourceful but if I did find myself in that situation and I wasn't prepared, I'd feel pretty stupid. So somebody mentioned "using your brain"… that's what I do and my brain tells me that having that rescue option is a very good idea.
Consider the inReach or PLB to be like a first aid kit. It's dead weight and you hope you will never need it.

