As WhatsApp becomes latest victim, are any messaging apps truly secure?

While some are more secure than others, there always seems to be another flaw waiting to be discovered - so should security be prioritized over convenience?

Is there a truly secure messaging app? One could spend hours examining all the encrypted communications tools available, from popular services such as WhatsApp and Facebook's Messenger to newcomers such as Signal and Wire. But while experts agree that some of these options are more secure than others, there always seems to be another flaw waiting to be discovered. This makes the search for a perfect app resemble the hunt for the goose that laid the golden egg.

Related: WhatsApp vulnerability allows snooping on encrypted messages