I think it would be cathartic to talk to someone you trusted but who is now gone. There's been decision points over the last few years where I would love to have just said my thoughts out loud to my dad and just have him nod and ask a couple of open ended questions so I could get it out. No specific guidance needed, just his particular style of listening.
Clearly losing someone and being able to deal with it is an important life skill but just as we build technology powered aids for other situations, I don't think this would be any different
Wow, impressive results! Already a few examples in the comments of what bad actors could do this tech. I wanted to share an example of something good.
I lost my dad about 6 years ago after a Stage 4 cancer diagnosis and a 3 month rapid diagnosis. I have some, but not a lot of video content of him from over the years. My mom still misses him terribly so for her 60th birthday I tried to splice together an audio message and greeting from her saying what I thought he would have said.
The work was rough and nowhere near what this Google project could produce. She listens to that poor facsimile every year for her birthday. It's therapeutic for her. With some limits for her mental health of course, I'm sure she would love to hear my dad again with this level of fidelity.
This knot is one of the top 10 things I learned online that I share with people. And they share it with their friends, teach their kids, who tell their friends, and so on.
It still comes up as a random topic of conversation at every conference I go to where I see someone retying their slippery laces.