I tried to watch the video... But damn the speaker is hard to pay attention to. I barely got through the intro.

Honestly, Signal was too unreliable and hard to use for me. I've lost too many messages, had issues with multi device use (with messages not syncing correctly or not being delivered everywhere). Security is cool but I need more reliability. Also my threat model is not that high.

They just gotta work on reliability and some more joy in the UX for regular folk. Might not be easy but I've seen too little progress in that direction over the years and I don't feel it's high on their priority list. At least that's the optics from a distance.