I once opened an issue for 15-second freezes after sending each message, +1'd by other users, and my bug report was closed and locked with a very rude message from one of the (paid!) developers to "Please, when you open a bug, talk about the user impact."
Seriously... are you kidding me? You have $50M and you're going to close and lock a bug about 15sec lag when sending messages because it's not obvious what the user impact is?
And if I, as a former developer, YC alum, etc. can't open a bug report without getting a rude lecture from the Signal team (seriously fuck you Scott Nonnenberg), what hope is there for a casual user? I went back to re-read it just to make sure I wasn't exaggerating, and nope! It makes me mad thinking about what would happen if my non-technical friends needed help. They'd just switch.
I really want Signal as a concept to succeed, but after having used it for years and seen the bugs, and the disregard the developers have for users, I think something like Telegram is unfortunately the better bet.