1 I'm not seeing any controversy here...
2 A float plan is basically to let the marina know how long they can rent out your slip while you're gone.
2 Funny!
1 I agree.
Woodster, the answers you've been given are essentially philosophical ones if you take each one individually.
Some folks do care about safety very much, but recognize it's their own responsibility, not a government agency, where further checking of that "app" for example indicates it's nothing but filling out a form that goes essentially nowhere.
PilotMech's great long answer covered a lot of bases with great reasoning and explanations.
So much of the appropriate answers have to simply do with "Where are you going?"
Many assumptions have been made but are unspecified.
For example, not ONE single reply suggested the use of a TELEPHONE!
99% of the sailing most of us do is coastal or inside protected waters. I don't even have a smart phone (my cell phone is so old it is a rotary dial model!!!) but I call home each evening when I'm out to let The Admiral know I'm OK. When she's with me, like on last weekend's cruise, I turn around to her and say, "Honey, we're OK!"
When coastal sailing here, we usually pull into an anchorage each night, which is close to land and cell phone coverage.
OTOH, going offshore, one simply needs to recognize the communications issues involved. I can go 25 miles offshore and still be in VHF contact with the CG here off the Northern California coast because their antenna is so far off the ground that I could probably go 50 miles offshore and still have VHF contact. Any further, then I'm thinkin' EPIRB or SPOT or InReach.
This long range VHF connectivity may not be available in the South or the East since there aren't high mountains for the CG antenna mounts.
So, there are quadruple answers to your question, in addition to the old essentially pen & paper "float plan" - a copy of which youcan get from the BoatUS website. Print it out and send it to your friends & relatives. I almost said fax it to them!

But you could scan it in as a jpg or pdf and email it to them, too.
Hope you get in the H2O asap. All the best.