It's still not an excuse to just ignore the security update because you might not be a target for hackers.
Just check your logs, there's probably a dozen or more requests trying to access wordpress pages on your server, or login via SSH. They want to take over your server so it can be part of a botnet.
So... not using Signal because it's based off a conspiracy theory that it's secretly funded by CIA?
Well, let's stop using RSA and encryption because the most used secure crypto algorithms today were created by none other than the NSA!
EDIT: None of the alternatives provided are good alternatives for Signal. Matrix is an extremely complicated protocol that lacks some features compared to normal IM apps (I use Matrix and the experience is quite close to a standard messaging app). XMPP is dead and has a very niche userbase. The others are not suitable for being a daily messaging app.
Signal is a good alternative and while I do agree with some points, they are not bad enough to prevent you from using it (e.g. not having usernames).