>"I just told my wife that if she didn't get a message one night to look for one the next night "
Or as I put it, Good news ("OK") is good news. No news is just no news. No news isn't bad news.
And if your partner can grasp that concept, great! But not everyone can. I was really clear about that prior to a 16-day Grand Canyon raft trip, and some families understood it and others freaked when we were camped in a tight spot for the night.
One possible way around that is to pay for the SPOT subscription that provides tracking. Track-track-track-track = everything is apparently fine. Track-track-track-no signal for a while in a wooded or canyon area, looks fine, too*. Versus the, "I'll signal you every night that I'm okay. If you get no signal, it just means I'm in the trees." getting interpreted as, ""I'll signal you every night that I'm okay. If you get no signal, it means a bear has eaten my torso and my SPOT device, too." Which isn't about the device, but about your partner.
*You can click on the link that SPOT emails or texts to your phone and it will direct you to a map with the location(s) on it.
If there is a real worry-wart on the home front, then the 2-way devices like InReach let you send a custom message. And even correct misunderstandings. For extreme stuff, anyone would rather message their exact situation ("broken leg, can't move, but not hypothermic", "totally lost, out of water", "heart attack, giving CPR") so the right rescuers respond with the right urgency. And especially in those grey areas – with a broken ankle on a trail, what I'd want is for them to send a pick-up truck to the trailhead with crutches and a splint, not to launch a helicopter.
In most backpacking settings, things you need urgently – shelter, water, warmth – (are ideally in your own gear but) are more quickly available from other hikers. OTOH, Manfred was able to text me with his InReach when his tent failed and I had one delivered to their next resupply point in the trail-less Brooks Range.
But tracking and messaging have subscription fees while a PLB (e.g. ResQ Link) does not.
>"I am at the trailhead, I made it to camp, I am back at the car."
Sounds like SPOT with tracking and your friends tracking your progress. Or InReach with its custom messages.
SPOT would be "set it and forget it". InReach would involve manually entering each text message.