I'm the same with some technological items. problem is, should I die first my wife won't be able to turn on the heating, the electric fire, open the car door, access the bank accounts, or operate the television because they are all remote control (hand sets or an app on the phone).
When I think I have less than three months to live and my wife is still here, I will have installed in my lounge a row of LARGE different coloured switches. The switches will operate whatever that is controlled now by an app or remote control now but at the 'flick of a switch'.
A friend asked me a while back if i had put together a 'death book'. What is that? I asked.
It seems a good idea to me now. Something that your partner can access after your demise, showing them where the money is kept (wink, wink) bank passwords, computer passwords, where the will, house deeds and pension info is kept etc. I'm sure there are more bits of information that need to be passed.
Happy days.