Having ADHD I've often wondered how I could even do a deadman switch. I'd eventually forget to renew it when I was otherwise perfectly fine.
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oh no
I think this is especially important in cases of dementia. Daily routines will become one of the last things to go, as long as there is good nagware in place to keep you in line.
I use nagware to remind me to take my medication, do my Duolingo practice, do my nightly checkins to GitHub, feed the various critters that don't or won't remind me themselves, and do my various work rituals. Weekly, monthly, and annual reminders (doctor appointments and birthdays) are also important.