We got along without such devices for decades but we got along without novocaine for decades too. Nothing wrong with using modern tools.
However, a person can also just forget to check-in. I tell the folks back home, "If you don't hear from me (within reason), that doesn't mean there's a problem."
Also, When I had tracking on, if I turned the unit off as soon as I was on shore, the last point on the "Where is he?" chart might show me a quarter-mile offshore or so. So you need to have an understanding of what the "responsible person" back home should expect and pay attention to.
Belt and Suspenders guy that I am, I have multiple means of communication, but not necessarily multiple "I'm here." devices with me. Our Library now has "HotSpot" devices to check out for 3 weeks at a time. My iPad has Skype for making phone calls if I have a WiFi connection (I don't have a cell phone model). The HotSpot will give me a WiFi connection via T-Mobile so I can use Skype or any other messaging App. In addition, I can get real-time weather updates and anything else available on the Web. I was using the iPad Mini as a navigation aid (with tide and current tables). Now I can access sites like DeepZoom and make phone calls (my Skype account lets me call phone numbers, not just computer-to-computer).
Few things are foolproof and risk is part of life. But, when a person says, "I don't need no stinking locator" they may be missing a couple of points. 1) People seldom go out with the pre-knowledge they will have a problem. 2) You might not need assistance but you may come across someone else who does. 3) In the same sense of "We're a community" in point 2), if you or someone you assist needs help, you may be putting the rescuers who come and get you at risk if they can't quickly find you.
I think about the mountain rescues we have around here in the winter. Or the one a few years ago where a guy called his wife, on his cell phone before it went Kaput - but didn't think to give her the Lat/long of his snow cave. And the S&R team had to search the north face of Mt. Hood for the lost climbers. How much more efficient if they knew the lat/long.
So these devices may not always work as expected, but they won't "work" at all if you leave them home or don't have them.