I think the best use case I’ve seen for nfc tags are periodic reminder reset. Place a nfc tag near your filter register then when you change your hvac filter, scanning the tag records the date which can then be used to send notifications when it’s time to change the filters again.

I set up two tags that trigger the Bedtime routine and taped one to the side of my wife and I's bedside tables. I much prefer scanning the tag over bothering with my phone or yelling at Google (until I give up and do it on my phone anyways).

I also set up a few medication reminder tags for my wife. Reminder triggers once an hour until she taps the tag on the pill bottle. Very handy with medications on different schedules.

The spouse acceptance factor is huge. Nothing for her to remember.

So how do you physically use these?

Have the tag on a surface, and touch your phone to it whilst connected to HA?

Never used RFID tags before, do you need to have the app open, or will it work with the phone locked?

NFC tag on a vacuum that enables "Clening scene": shared spaces lights on maximum, favourite cleaning playlist on