I personally have no problem with them going through my stuff. Not the "I have nothing to hide" defence. I just don't give a crap.
With respect to my personal situation, my father took thousands of photos of me, my children etc back as far as 2002. Sent me a selection low res jpegs of them by email. I was thrilled when I got the original RAWs from his NAS in the end. There was so much stuff in there I had forgotten that he hadn't sent.
Everything else will be inaccessible if I'm not around. This also means less faf for them: all the info they need to care about is in that package, they don't need to look at the huge disorganised pile of everything else to find the information that they might need.
I'd say if you want someone to have data or access, you should work that out in time.
But delete everything is good advice. I'd emphasize also keeping some list of services that you may have accounts or logins in and delete and close and erase every single one that you're not using.
I've seen tears shed because a wife couldn't get into her dead husband's iPhone to get the photos off from their final holiday together.
Technology is HORRIBLE in this space socially speaking.