They don't care that they are uploading their entire contact list to Facebook — "death before inconvenience".
Whatsapp is THE messaging standard in my country. Hell, even our politicans use it for communication. "Apping" is even used by news outlets to describe communication by Whatsapp.
We used to have SMS and MSN. Now it's either Whatsapp or Messenger. Depending only on the fact if you have the others phone number or not.
- message delivery was not very reliable when your connection is poor and intermittent (think wifi in the underground between stations)
- when you need to resend a message in a group, you need to tap "retry" once for every recipient in the group
Issues that my friends complained about, justifying their non-use of Signal:
- you cannot create links to allow people to join groups (obviously this is a nonstarter, without first allowing people to be in groups pseudonymously)
I applaud the direction they've taken. These are the kinds of features that will acquire and retain a broader user base.